He would be your spouse's uncle and you do not share a common ancestry. In most families you would refer to him as uncle. And you would be referred to as their niece or nephew.
Legally, nothing. He would be your wife's uncle and in most families you would refer to him as uncle as well.
Your cousin.
Your father's brother is your uncle. Your mother's sister's husband is your uncle. The English language makes no distinction based on whether the brother is older or younger.
Your father's brother is your uncle. English does not have different names for a father's elder and younger brother. If you are a boy, you are your uncle's nephew; if you are a girl, you are his niece.
No.
When this is Elder Horus, the brother of Osiris, Isis, Set, and Nephthys.
You wife's uncle or "uncle by marriage".
great uncle inlaw
You can call your husband's elder brother as "Anna" in Tamil.
in-laws. My wife's mother is my mother in law. My wife's brother is my brother in law. (and so on)
No, your father's brother's son is your cousin. Unless, you have the same mother in which case you would be both cousins and siblings.
the same what you would feel if you were the elder brother........
In Tamil, elder brother is called "அண்ணன்" (Anna).