No relation ..
You are not related. Your granddaughter is by marriage.
No.
Your mother's brother is your uncle. Your father is his brother-in-law but he could also have other brothers-in-law. These would be men married to his other sisters, or the brothers of his wife. If they are men who married his other sisters, they are your uncles. If they are brothers of his wife, they are not related to you.
There is no genealogical relationship. He is just your son-in-law's brother.
great uncle inlaw
You wife's uncle or "uncle by marriage".
Your Sister In Laws parents will be your Mother and Father In Law.
If your brother adopted you, you are his son or daughter and his in-laws are your grandparents by adoption.
in-laws. My wife's mother is my mother in law. My wife's brother is my brother in law. (and so on)
Your wife's sister's husband is your wife's brother-in-law, but is not related to you.
They are brother-in-laws.
Since it would be your sister who had the child with her husband (your brother-in-law) then that would make their child your niece or nephew.