which 在非限制性定语从句中能否指代人？

Question

改错I think the mother bird must be very proud of her children,that are able to find their own food now. 答案把本句话中that改成who， 改成which行不行？

Answer 1

which指代人的时候一般习惯性用which one 或者which person，一般不单独用。感觉很没礼貌。因为一般用来指代物。

Answer 2

我认为是可以的。