Yokogawa-Tan vs. Tan

Sexual infidelity, while enumerated as a ground for legal separation under Article 55 of the Family Code, may also constitute a manifestation of psychological incapacity under Article 36 when established as a manifestation of a disordered personality that completely prevents the spouse from discharging essential marital obligations, provided the incapacity is shown to possess juridical antecedence, incurability, and gravity.

Aiko Yokogawa-Tan and Jonnell Tan met at a Christmas party in December 2003, became friends, and eventually lived together for several years until Aiko became pregnant, prompting the parties to marry on January 29, 2012. Their only child, Aimii Tan, was born on June 6, 2012. The petition sought a declaration of nullity of marriage under Article 36 of the Family Code, which declares void a marriage contracted by a party psychologically incapacitated to comply with essential marital obligations. The case was litigated against the backdrop of evolving jurisprudence on psychological incapacity, from the restrictive Molina guidelines to the refined Tan-Andal framework, which abandoned the requirement of medical or clinical identification and emphasized proof of a personality structure incompatible with marital obligations.

Aiko Yokogawa-Tan and Jonnell Tan met at a Christmas party in December 2003 and became friends. Jonnell pursued Aiko, making her feel valued, and they dated and eventually lived together for several years. When Aiko became pregnant and her pregnancy became apparent, the parties decided to marry. They were wed on January 29, 2012 by Rev. Herman O. Rosales at the Living Stones on the Rock Church in Quezon City, and initially resided at Illumina Residences in a unit acquired by Jonnell's parents.

Their only child together, Aimii Tan, was born on June 6, 2012. Aiko stayed at her parents' house to recover from her caesarean delivery, but Jonnell barely visited, acting as "a mere guest, a fleeting visitor" on the rare occasions he appeared, offering no help with her postpartum recovery or care of their newborn. Upon returning to the conjugal abode, Jonnell was gone all day, returning only in the wee hours of the morning. He became cold, avoiding conversation, bonding, and sexual intimacy. A particularly painful episode occurred when their infant daughter Aimii fell off a sofa; Jonnell simply walked out, leaving Aiko to call her mother and a friend for help so the child could be rushed to a nearby emergency room.

Aiko later accidentally discovered a text message from a medical clinic addressed to Jonnell, stating that his daughter was due for a check-up. She visited the clinic and found the name of Jonnell's daughter with another woman. She learned that Jonnell and this other woman had a vegetable stall at a nearby marketplace, and that even before the marriage, Jonnell had already been in a relationship with her. In January 2015, Jonnell left the conjugal home and continued living with his mistress, compelling Aiko to return to her parents' house.

On November 14, 2016, Aiko filed a Petition for Declaration of Nullity of Marriage on the ground of psychological incapacity, alleging Jonnell's clear failure to comply with his obligations as a husband to show love, respect, fidelity, and moral and psychological support. Summons was served upon Jonnell by substituted service, but he did not file an Answer. Trial Prosecutor Ireneo Quintano found no collusion between the parties. Clinical psychologist Dr. Nedy L. Tayag conducted a psychological evaluation and reported that the marriage failed due to both parties' respective psychological incapacities. She diagnosed Aiko with dependent personality disorder, manifested in difficulty expressing disagreement, incorrigible lack of self-efficacy, and excessive efforts to obtain nurturance—attributed to faulty childrearing practices. She diagnosed Jonnell with antisocial personality disorder, manifested in irresponsibility, unfaithfulness, and lack of remorse, rooted in the lack of discipline during his developmental years and reinforced by witnessing his father's womanizing. Dr. Tayag declared both conditions grave, serious, incurable, and rooted in upbringing, and recommended that the petition be granted.

The Regional Trial Court dismissed the petition on May 7, 2018 for insufficiency of evidence, finding that Aiko failed to convince the court that the marriage deserved nullification. The Court of Appeals affirmed this dismissal on November 27, 2020, holding that the spouses' actuations did not demonstrate psychological incapacity and that Dr. Tayag's report failed to establish juridical antecedence and incurability, being based only on one-sided narrations from Aiko and her friend.

• Expert Testimony: Petitioner argued that the RTC and CA erred in ignoring the testimony of Dr. Tayag, a clinical psychologist whose expertise has been recognized by Philippine courts. Petitioner contended that Dr. Tayag's expert testimony and medical report sufficiently showed, explained, and proved the parties' psychological incapacity, and that this diagnosis was never contravened or disputed by any countervailing evidence, as neither the respondent nor the State presented any evidence.
• Nature of Marriage: Petitioner maintained that it would be impossible for a marriage to work when only one party is willing to perform marital obligations, and that granting the petition would protect the sanctity of marriage by disallowing a person who cannot comply with essential marital obligations to remain in that sacred bond.
• Tan-Andal Guidelines: Petitioner maintained in her Reply that the guidelines in Tan-Andal vs. Andal were satisfied.
• Compassionate Justice: Petitioner pleaded for the Court to accord compassionate justice to her and her child, who was abandoned by her father, and the opportunity to enjoy life to the fullest and become part of a whole family once again.

• Insufficiency of Evidence: The Republic of the Philippines, through the Office of the Solicitor General, countered that the Court of Appeals correctly found that petitioner failed to prove that either she or private respondent was psychologically incapacitated to fulfill essential marital obligations.
• Non-Participation: Private respondent Jonnell Tan, despite notice, did not file a Comment.

• Psychological Incapacity: Whether the Court of Appeals erred in ruling that petitioner failed to demonstrate either of the spouses' psychological incapacity under Article 36 of the Family Code.
• Sexual Infidelity as Manifestation: Whether sexual infidelity, a ground for legal separation under Article 55, may also constitute a manifestation of psychological incapacity under Article 36.
• Expert Testimony Without Personal Examination: Whether expert testimony on psychological incapacity is valid despite the expert not having personally examined the allegedly incapacitated spouse.

• Psychological Incapacity: Yes. The CA erred; respondent Jonnell Tan is psychologically incapacitated to fulfill essential marital obligations, the totality of evidence establishing with clear and convincing evidence the requirements of juridical antecedence, incurability, and gravity under the Tan-Andal framework.
• Sexual Infidelity as Manifestation: Yes. Sexual infidelity, while a ground for legal separation, may also be a manifestation of psychological incapacity when established as linked to a disordered personality that completely prevents the spouse from discharging essential marital obligations.
• Expert Testimony Without Personal Examination: Yes. Expert testimony need not rely on a personal examination of the allegedly incapacitated spouse, so long as the totality of evidence sufficiently supports a finding of psychological incapacity.

• Psychological Incapacity: The Court applied the refined Tan-Andal framework, which sets clear and convincing evidence as the quantum of proof, abandons the Molina requirement that psychological incapacity be medically or clinically identified and proven by experts, and instead requires proof of a personality structure that makes it impossible to understand and comply with marital obligations. The three characteristics—juridical antecedence, incurability, and gravity—were all satisfied as to respondent. Juridical antecedence was established because respondent's behavioral patterns, specifically his sexual infidelity, were manifest since before the celebration of the marriage, and Dr. Tayag traced these to his childhood lack of discipline and exposure to his father's womanizing. Incurability was shown because respondent's maladaptive behaviors became established and permanent pillars of his person, affecting all his functions including his role as a spouse, and his personality was so incompatible and antagonistic with petitioner's that the marriage was bound for inevitable and irreparable breakdown. Gravity was satisfied because respondent's incapacity was deep-seated in his personality structure, rooted in a genuinely psychic cause—antisocial personality disorder—and was neither mild nor occasional. Although Dr. Tayag also diagnosed petitioner with dependent personality disorder, petitioner failed to satisfactorily establish how that disorder related to her fulfillment of essential marital obligations. In any case, the psychological incapacity of one spouse is sufficient to declare a marriage void ab initio.

• Sexual Infidelity as Manifestation: The Court held that the existence of grounds for legal separation does not foreclose the possibility of psychological incapacity. Citing Tan-Andal vs. Andal, the Court ruled that a decree of legal separation entitles spouses to live separately without severing the marriage bond, but no legal conclusion is made as to whether the marriage is valid; it is therefore possible that the marriage is attended by psychological incapacity manifested in ways that also constitute grounds for legal separation. Drawing on Clavecilla vs. Clavecilla and Castillo vs. Republic, the Court clarified that sexual infidelity may be deemed a manifestation of psychological incapacity when the unfaithfulness is established as a manifestation of a disordered personality completely preventing the spouse from discharging essential marital obligations, and there is proof of a natal or supervening disabling factor that effectively incapacitates the spouse from complying with the obligation of fidelity. In this case, respondent's sexual infidelity was consistent with Dr. Tayag's findings of antisocial personality disorder, characterized by disregard for others' rights, manipulation, impulsivity, and lack of remorse. His blatant disregard of the consequences of his affair on petitioner, his failure to show concern after childbirth, and his abandonment of his family constituted clear acts of dysfunctionality showing a lack of understanding and compliance with essential marital obligations due to psychic causes.

• Expert Testimony Without Personal Examination: The Court held that expert witnesses testify not from personal knowledge of facts but from special knowledge, skill, experience, or training, pursuant to Rule 130, Section 49 of the Rules of Court. Citing Santos-Gantan vs. Gantan and Marcos vs. Marcos, the Court ruled that the non-examination of one of the parties does not automatically render expert findings hearsay or invalid, because marriage necessarily involves only two persons and the totality of one spouse's behavior during cohabitation is genuinely witnessed mainly by the other. The absence of personal examination is not fatal so long as the totality of evidence sufficiently supports a finding of psychological incapacity. Dr. Tayag's findings, though based primarily on Aiko's narrations, sufficiently supported the conclusion that respondent was psychologically incapacitated, especially as no countervailing evidence was presented.

• Tan-Andal Framework on Psychological Incapacity — The appropriate quantum of proof in psychological incapacity cases is clear and convincing evidence. The Molina requirement that the incapacity be medically or clinically identified and sufficiently proven by experts is abandoned; instead, courts require proof of a person's personality structure that makes it impossible to understand and comply with marital obligations. The three characteristics of psychological incapacity are: (1) juridical antecedence—the incapacity exists at the time of celebration, even if it manifests only during the marriage, and may be proven by testimonies describing the environment where the supposedly incapacitated spouse lived; (2) incurability—viewed in the legal, not medical, sense, requiring that the incapacity be so enduring and persistent with respect to a specific partner that the couple's personality structures are so incompatible and antagonistic that the only result would be the inevitable and irreparable breakdown of the marriage; and (3) gravity—the incapacity must be caused by a genuinely psychic cause, not mere mild characterological peculiarities, mood changes, occasional emotional outbursts, or mere refusal, neglect, difficulty, or ill will. The Court applied all three characteristics to respondent, finding juridical antecedence in his pre-marital infidelity traceable to childhood, incurability in the permanence of his maladaptive behaviors, and gravity in his deep-seated antisocial personality disorder.

• Sexual Infidelity as Manifestation of Psychological Incapacity — Although sexual infidelity is a ground for legal separation under Article 55 of the Family Code, it may also be a manifestation of psychological incapacity under Article 36 when established as linked to a disordered personality that completely prevents the spouse from discharging essential marital obligations. There must be proof of a natal or supervening disabling factor that effectively incapacitates the spouse from complying with the obligation of fidelity. The Court applied this doctrine by linking respondent's infidelity to his diagnosed antisocial personality disorder, characterized by disregard for others' rights, manipulation, impulsivity, and lack of remorse.

• Expert Testimony Without Personal Examination — The non-examination of the allegedly incapacitated spouse does not automatically render expert findings hearsay or invalid, because marriage involves only two persons and the totality of one spouse's behavior during cohabitation is genuinely witnessed mainly by the other. The absence of personal examination is not fatal so long as the totality of evidence sufficiently supports a finding of psychological incapacity. The Court relied on this doctrine to uphold Dr. Tayag's findings despite her not having personally examined Jonnell.

• Gender-Fair Language in the Judiciary — The bench and bar are reminded to abide by the Guidelines on the Use of Gender-Fair Language in the Judiciary and Gender-Fair Courtroom Etiquette. The Court took exception to the RTC decision's non-gender-fair language, which implied the petitioner was at fault for marrying an unfaithful man and reinforced the trope that women entrap men into marriage.

• "The existence of grounds for legal separation does not foreclose the possibility of psychological incapacity." — This opening line of the decision articulates the central doctrinal proposition: that behavior constituting grounds for legal separation may simultaneously manifest psychological incapacity under Article 36, provided the requisite characteristics are established.

• "In order for sexual infidelity to constitute as psychological incapacity, the respondent's unfaithfulness must be established as a manifestation of a disordered personality, completely preventing the respondent from discharging the essential obligations of the marital state; there must be proof of a natal or supervening disabling factor that effectively incapacitated him from complying with the obligation to be faithful to his spouse." — This passage, quoting Castillo vs. Republic, sets the standard for when sexual infidelity crosses from a ground for legal separation into a manifestation of psychological incapacity, requiring a demonstrated link between the acts and the underlying psychological disorder.

• "Unlike ordinary witnesses who must have personal knowledge of the matters they testify on, expert witnesses do not testify in court because they have personal knowledge of the facts of the case. The credibility of expert witnesses does not inhere in their person; rather, their testimony is sought because of their special knowledge, skill, experience, or training that ordinary persons and judges do not have." — This passage explains the rationale for admitting expert psychological testimony even without personal examination of the allegedly incapacitated spouse, distinguishing the basis of expert credibility from that of ordinary witnesses.

• Republic vs. Court of Appeals and Molina, 335 Phil. 664 (1997) — Established the original 8-point guidelines for determining psychological incapacity under Article 36. The Court in this case applied the Tan-Andal refinements, which modified several Molina guidelines, including abandoning the requirement of medical or clinical identification by experts.

• Ngo Te vs. Yu-Te, 598 Phil. 666 (2009) — Observed that the Molina guidelines created an overly restrictive standard, forcing all cases into a strait-jacket and allowing sociopaths, schizophrenics, and others with personality disorders to continuously debase the sanctity of marriage. This case laid the groundwork for the Tan-Andal revision.

• Tan-Andal vs. Andal, G.R. No. 196359, May 11, 2021 — The controlling precedent that refined the Molina guidelines: established clear and convincing evidence as the quantum of proof, abandoned the requirement of medical or clinical identification, and restated the three characteristics of juridical antecedence, incurability, and gravity. The Court applied this framework throughout its analysis.

• Georfo vs. Republic, G.R. No. 246933, March 6, 2023 — Summarized the Tan-Andal characteristics of psychological incapacity, providing the formulations for juridical antecedence, incurability, and gravity that the Court applied to respondent's case.

• Santos-Gantan vs. Gantan, 888 Phil. 141 (2020) — Held that the non-examination of one party does not automatically render expert findings hearsay or invalid, since marriage involves only two persons and one spouse's behavior is genuinely witnessed mainly by the other. The Court relied on this to uphold Dr. Tayag's findings despite her not having examined Jonnell.

• Clavecilla vs. Clavecilla, G.R. No. 228127, March 6, 2023 — Held that although sexual infidelity is a ground for legal separation, it may also be deemed a manifestation of psychological incapacity. The Court applied this principle to respondent's infidelity.

• Castillo vs. Republic — Elucidated that there must be evidence linking the unfaithfulness with the inability to perform essential spousal obligations, requiring proof of a natal or supervening disabling factor. The Court quoted this formulation as the standard for treating sexual infidelity as psychological incapacity.

• Republic vs. Mola Cruz, 836 Phil. 1266 (2018) — Cited for the proposition that blatant insensitivity and lack of regard for the sanctity of the marital bond cannot be expected from a married person who reasonably understands the principles and responsibilities of marriage.

• Article 36, Family Code — Declares void a marriage contracted by any party who, at the time of the celebration, was psychologically incapacitated to comply with the essential marital obligations of marriage, even if such incapacity becomes manifest only after its solemnization. This was the operative provision under which the marriage was declared null and void.

• Article 55, Family Code — Enumerates grounds for legal separation, including sexual infidelity. The Court held that the existence of grounds for legal separation does not foreclose the possibility of psychological incapacity under Article 36.

• Articles 68–71, Family Code — Define the essential marital obligations of husband and wife, including mutual love, respect, fidelity, and support. The Court found that respondent failed to fulfill any of these obligations.

• Rule 130, Section 49, Rules of Court — Provides that the opinion of a witness on a matter requiring special knowledge, skill, experience, or training which the witness is shown to possess may be received in evidence. The Court cited this provision to uphold the admissibility and sufficiency of Dr. Tayag's expert testimony.

M. Lopez, J. Lopez, and Kho, Jr., JJ., concurred. Lazaro-Javier, J., was on official business.