My parents' siblings called me niece(I am a girl), and called my brother nephew.

我父母的兄弟姐妹叫我外甥女/侄女，叫我弟弟外甥/侄子。

youdao

Help me to take care of my seventh uncle and his third niece.

帮我照顾好我七舅姥爷和他的三外甥女。

youdao

I played my niece at chess and she beat me all ends up.

我同侄女下棋，结果她把我彻底打败了。

youdao

I played my niece at chess and she beat me all ends up.

我同侄女下棋，结果她把我彻底打败了。

youdao