President Elpidio Quirino signed Republic Act No. 386, enacting the Civil Code of the Philippines on June 18, 1949. The Code replaced the Spanish Civil Code of 1889 which had governed Philippine civil relations since the colonial period. It took effect on August 30, 1950.

The Civil Code of the Philippines officially took effect on August 30, 1950, exactly one year after its publication. From this date forward, it governed all civil relations in the Philippines, superseding the Spanish Civil Code of 1889.

The Supreme Court upheld the constitutionality of various provisions of the newly-enacted Civil Code against challenges questioning its validity. The Court affirmed that the new Code was a valid exercise of legislative power and properly replaced Spanish civil law.

The Supreme Court clarified the crucial distinction between void marriages (which do not exist from the beginning) and voidable marriages (which exist until annulled) under Articles 80-92 of the Civil Code. This distinction affects property relations, legitimacy of children, and other civil consequences.

Executive Order No. 209, the Family Code of the Philippines, was signed by President Corazon Aquino on July 6, 1987, and took effect on August 3, 1988. It repealed and replaced Book I (Articles 1-251) of the Civil Code concerning family relations, including marriage, legal separation, property relations, and parental authority.

The Supreme Court expounded on Article 19 of the Civil Code, which establishes the principle of abuse of rights. The Court held that a person who exercises a right but does so in bad faith, with intent to prejudice another, or contrary to morals or good customs, must compensate for damages caused.

The Supreme Court established stringent guidelines for determining psychological incapacity under Article 36 of the Family Code (related to Civil Code nullity concepts). The Molina doctrine required proof that the incapacity must be grave, have juridical antecedence, and be incurable.

The Supreme Court clarified the procedure for liquidation of conjugal partnership of gains under Articles 102-133 of the Civil Code, particularly regarding properties acquired during marriage. The Court emphasized that proper liquidation must precede any partition.

The Supreme Court comprehensively discussed prescription periods under Articles 1139-1155 of the Civil Code, clarifying when actions prescribe and how prescription is interrupted. The ruling emphasized that prescription is a matter of substantive law, not procedure.

The Supreme Court clarified the principle of relativity of contracts under Article 1311, holding that contracts bind only the parties who execute them and cannot prejudice third persons. The Court enumerated exceptions where third parties may be bound or benefited.

The Supreme Court expounded on Articles 1170 and 2199-2211 regarding damages for breach of contractual obligations. The Court clarified when actual, moral, nominal, temperate, and exemplary damages are properly awarded in civil cases.

The Supreme Court clarified provisions on legitime under Articles 886-906 of the Civil Code, emphasizing that legitimes of compulsory heirs are inviolable and cannot be impaired by testamentary dispositions or donations inter vivos that exceed the free portion.

The Supreme Court En Banc abandoned the rigid Molina guidelines for psychological incapacity, adopting a more flexible approach to Article 36 of the Family Code. While interpreting Family Code provisions, this affects understanding of void marriages under the Civil Code framework.