The filiation of illegitimate children, like legitimate children, is established by (1) the record of birth appearing in the civil register or a final judgment; or (2) an admission of legitimate filiation in a public document or a private handwritten instrument and signed by the parent concerned. In the absence thereof, filiation shall be proved by (1) the open and continuous possession of the status of a legitimate child; or (2) any other means allowed by the Rules of Court and special laws. The due recognition of an illegitimate child in a record of birth, a will, a statement before a court of record, or in any authentic writing is, in itself, a consummated act of acknowledgment of the child, and no further court action is required. In fact, any authentic writing is treated not just a ground for compulsory recognition; it is in itself a voluntary recognition that does not require a separate action for judicial approval. Where, instead, a claim for recognition is predicated on other evidence merely tending to prove paternity, i.e., outside of a record of birth, a will, a statement before a court of record or an authentic writing, judicial action within the applicable statute of limitations is essential in order to establish the child's acknowledgment. ( Aguilar vs. Siasat, GR No. 200169, January 28, 2015)
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