If your brother-in-law is your spouse's brother, then his father is your father-in-law. If you brother-in-law is your sister's husband, then his father is not your father-in-law, and is not related to you in any way..
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No. Your brother's father-in-law is the father of your brother's wife and is not related to you.
Your father-in-law is the father of your wife.
No, her biological father is your father-in-law, and her stepfather is your stepfather-in-law. If you have kids, he will be their step-grandfather.