What does sister-in-law's son call sister?

In the brother-sister relationship, the younger brother calls his sister's children nephews. In sisterhood, the elder sister calls the elder sister's son a nephew, and the younger sister calls the elder sister's child a nephew.

1, if you are a man: your sister or her child is a nephew; The children of wives and brothers are called nephews, and the children of wives and sisters are called nieces; His brother or younger brother's son is a nephew.

2. If you are a lady: your brother or younger brother's child is a nephew; The husband's sister or sister's child is a nephew; The son of a husband's brother or younger brother is a nephew.

3. Therefore, my sister named my brother's son nephew, and my brother named my sister's child nephew. But in the sisterhood, the elder sister calls the elder sister's son a nephew, and the younger sister calls the elder sister's child a nephew.