Unmarried Couples and Property Rights in the Philippines: Co-Ownership in Illicit Relationships

When two people live together without the benefit of marriage, questions about who owns what can become complicated. The situation becomes even more complex when one or both parties are still legally married to someone else. A 2000 Supreme Court decision, Mallilin v. Castillo (G.R. No. 136803), clarified how Philippine law treats property acquired during such relationships.

This case is significant because it established that even couples who cannot legally marry each other may still have co-ownership rights over properties they acquired together. The ruling also addressed important procedural questions about how co-owners can assert their claims over registered properties.

The Facts of the Case

Eustaquio Mallilin, Jr. and Ma. Elvira Castillo were both married to other people but separated from their respective spouses. They began cohabiting in 1979 while their marriages were still valid and subsisting. During their relationship, they established a customs brokerage business together, with Mallilin as president and Castillo as vice-president and treasurer.

The business prospered, and the couple acquired real and personal properties. However, these properties were registered solely in Castillo's name. When the relationship ended in 1992, Mallilin demanded his share of the properties. Castillo refused, claiming she was the exclusive owner since the properties were registered in her name.

Mallilin filed a complaint for partition, accounting, and damages. Castillo moved for summary judgment, arguing that since both parties were legally married to others, no co-ownership could exist between them under the law.

The Legal Issue

The central question was whether a man and a woman who live together while both are still married to other people can be considered co-owners of properties they acquired during their relationship.

A related procedural issue concerned whether an action for partition constitutes a collateral attack on certificates of title, which Philippine law generally protects from indirect challenges.

The Supreme Court's Ruling

The Supreme Court ruled in favor of Mallilin, reversing the Court of Appeals' amended decision and remanding the case for trial on the merits.

Article 148 of the Family Code applies. The Court clarified that while Article 144 of the Civil Code (which governed co-ownership for unmarried couples) did not apply to adulterous relationships, Article 148 of the Family Code specifically addresses this situation. This provision states that when parties who are incapacitated to marry each other cohabit, only properties acquired through their actual joint contribution of money, property, or industry shall be owned in common, in proportion to their contributions. In the absence of proof to the contrary, their contributions and shares are presumed equal.

Genuine factual issues existed. The Court found that summary judgment was improper because there were genuine issues requiring trial. Mallilin claimed the properties were acquired from the couple's business profits and registered in Castillo's name by agreement. Castillo denied cohabitation and claimed sole ownership. These conflicting factual claims required presentation of evidence.

Partition is not a collateral attack on title. The Court explained that an attack on a certificate of title is direct when the action seeks to annul or set aside the judgment behind the title. It is collateral when the attack is made incidentally in an action seeking different relief. Mallilin's complaint did not allege fraud or irregularity in the registration. Instead, he sought a declaration of co-ownership and conveyance of his share. This is consistent with the nature of a partition action, which recognizes the validity of the title while asserting a claim of ownership.

Properties of non-parties should be excluded. The Court noted that some properties were registered in the names of Steelhouse Realty and Development Corporation and Eloisa Castillo, who were not parties to the case. The Court held that these properties should simply be excluded from the partition action rather than dismissing the entire case.

Practical Takeaways

• Cohabitation without marriage can create co-ownership rights, even when the parties are not legally capacitated to marry each other. Under Article 148 of the Family Code, properties acquired through actual joint contributions are owned in common proportion to those contributions.

• The presumption of equal contribution applies when there is no proof to the contrary. This means that in the absence of evidence showing otherwise, courts will presume that cohabiting parties contributed equally to properties acquired during their relationship.

• Shares may accrue to a valid marriage. If one party is validly married to someone else, that party's share in the co-ownership accrues to the absolute community or conjugal partnership of the valid marriage.

• Bad faith can lead to forfeiture. If a party acted in bad faith and is not validly married to another, that party's share may be forfeited as provided by law.

• Partition actions do not automatically constitute collateral attacks on titles. A co-owner can seek partition and conveyance of shares without necessarily challenging the validity of the certificate of title itself.

• Properties registered under third-party names should be excluded from partition actions if those third parties are not joined as parties to the case.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.