I did figure that out when I saw the other post.
It could also be your Uncle's wife's sister which was the first one I thought of. So she wouldn't be blood related. Either or.
Better re-think that; the sister in law of your father’s only brother is your father’s wife. But nice try at confusing me. Lol.
No, think about this, I'm not trying to confuse you. Let's call your father's brother Ted. Ted has a wife. Ted's wife has a sister named Mary.
Mary is Ted's sister in law, and he is her brother in law.
Your father's wife would also be Ted's sister in law. Both answers are correct, unless you say that Ted is unmarried as part of the question.
We never established that Ted was married, but I have to give you credit for that thought process. Lol.
(post is archived)