So, I am related to my wife's sister not by blood, we don't have any common parents or grandparents, but I am related to her by marriage because she is my sister-in-law, she is my wife's sister.
所以,我
我老婆的姐姐没有血缘关系,我们没有共同的父母或祖父母, 但我
她有姻亲关系, 因为她是我的嫂子,她是我老婆的姐姐。