Is the word "uncle-in-law" commonly used when talking about the husband married to your mother's sister?
Or is this person typically still called your "uncle", even though the person is not a blood relative?
Learn English – Is the word “uncle-in-law” used
kinship-termsnounsusage
Best Answer
No, not in my experience. My mother doesn't have a sister, but my father does, and his sister's husband has always been "Uncle Jim" to me. I would not occur to me to use the term "uncle-in-law" for him.
Indeed, I would assume it would refer to someone who is the uncle of my spouse. That is, it seems to me that, if we used such term, my spouse's parent's sibling or my spouse's parent's sibling's spouse would be my "uncle-in-law". But we really don't.