What are the conditions for accepting an heir's acknowledgment concerning another potential heir?

Primary text

If the acknowledged party is an adult, their affirmation is required for the acknowledgment to be fully accepted. If the acknowledged party is a minor whose statement is not considered, the lineage is not established solely by the statement of the other party, just as if two parties were involved and one was a minor, the adult's acknowledgment of a third heir would not be accepted without the consideration of the minor.