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Chachi
You are not related to your uncles wife sister. However some may think an aunt
The English language does not contain a specific term to describe a relationship between you and your nephew's wife. The culture does not consider her to be related to you. Most aunts and uncles would merely call her "my nephew's wife."
I call them my uncles
Nieces.
Your cousin in law
Bob No bog
There is no specific relation. They're just a distant relative. But if you are very close to them, you would often call them your cousin, even though that isn't the case.
your second cousin- in law or by her name lol
Not genetically, they are your aunt as in family but you do not share and blood with them.
Your aunts and uncles are the sisters and brothers of your parents. So they are "blood related." But you also call the husband of your mother's sister your uncle, and he is not "blood related." So aunts and uncles are not always really related to you.
Your uncle would be your sons great uncle. Normally your Son would also call him 'Uncle .... '