In English, you call your maternal uncle's wife "aunt." It's not rocket science, honey. Just like how you call your paternal uncle's wife "aunt," keep it simple and call her the same thing.
Chachi
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."
You are not related to your uncles wife sister. However some may think an aunt
In everyday conversation, you would simply say, "My wife's cousin." To be more formal, you might say, "first cousin-in-law."
In Runyankole, your uncle's wife is called "nnyabo." This term is used to refer to the wife of one's paternal or maternal uncle. It is a respectful way to address her in the context of family relationships.
The English language has no special name for a nephew's wife and does not consider you to be related to you. You would simply call her "my nephew's wife."
He would be your brother-in-law
your great uncle
The English language has no specific term for a relationship between your uncle and your wife. Your uncle will usually call her "my nephew's wife" and she can call him "my husband's uncle."
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
Your brother's wife's cousins are not related to you and the English language has no special term for that. The same applies to the cousins of a stepbrother's wife.