This document summarizes two cases related to establishing filiation or parent-child relationship under Philippine law:
1) Gapusan-Chua vs CA (1990) - The Supreme Court ruled that documents naming the petitioner as the daughter of the deceased, including an insurance application and sworn statement of assets, constituted "authentic writings" establishing voluntary acknowledgment of the petitioner as a natural child under the law, even without judicial approval.
2) Uyguangco vs CA (1989) - The petitioner claimed to be the illegitimate son of the deceased based on continuous possession of status as a child. However, the Court held he could not prove filiation this way since the action must be brought during the