Your father's brother is your uncle, and you are his nepher or niece.
your 5th cousin
Your father's brother is your uncle.
Your fathers brother is your uncle.
uncle
uncle
Your Step-brother. If he isn't your brother but he is your father's son, he's you.
aunt
cousin
uncle.
The sister-in-law of your father's only brother could be your mother. If, instead, she is the sister of your uncle's wife, she is not related to you at all. You share no common ancestor with her.
Yes.
your 5th cousin