For the source text click/tap here: Ketubot 101
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A new Mishna describes ancient child support.
If a woman remarries, her new husband should agree to support the woman's previously conceived/grown daughter for five years.
This does not cancel out the support provided by a previous husband; the ex-husband provides monetary support, and the current husband provides sustenance (food, etc.).
The husbands do not team up to provide less to the daughter. If the daughter is married, she is sustained by her new husband, but her father and step-father provide monetary support.
We explore adoption in antiquity as well as in halacha, with a review of its practice in the US and in modern Israeli law.