Let's guess.Who's that?

问题描述:

Let's guess.Who's that?
A man looked at a photo and said,“That person's father's is my father' son.I've no brothers or sisters Who is he?”
Why?

HE IS THE MAN'S SON.
图中人的父亲是说话人的父亲的儿子,说话人没有兄弟姐妹.
即:说话人是图中人的父亲,图中人是说话人的儿子.