the man who wears sunglasses who is my father,
问题描述：
the man who wears sunglasses who is my father,
是不是the man who wears sunglasses is my father更好一些?
为什么呢
答
the man who wears sunglasses is my father.
这句正确
The man（主语） who wears sunglasses（修饰主语的定语从句） is （系动词）my father（表语）.
如果在is 前加个who,结构全乱了!（见上面的结构分析）