Who is your mother's brother's only brother-in-law?

Answer 1

Your mother's brother is your uncle. His brother-in-law could be your father, but could also be another uncle - the husband of one of your mother's sisters - or somoene not related to you at all - the brother of his wife.

Answer 2

Your mother's brother is your uncle.

If your uncle has only one brother-in-law, he is either:

1. Your mother's other brother and your uncle's wife has no brothers, or
2. He is the brother of your uncle's wife (not relation to you) and your mother has no other brothers.

Answer 3

The two of you do not share a common ancestor. Your mother-in-law's brother would be the uncle of your spouse.

Answer 4

You