TOPIC:

"兼祧" is a form of adoption, which refers to a man inheriting two or more families at the same time.

Here is a very detailed explanation：
zh.wikipedia.org/zh-sg/%E5%85%BC%E7%A5%A7

There are many such situations in Chinese genealogy, how should I deal with the relationship between children and parents?
Among adopted, foster,rada which one should I choose?