When your aunt is your aunt because she married your father's brother, her mother is not related to you.
Nothing really. There is no blood relationship between the two.
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.
Your mother's brother is your uncle. Any child of your mother's brother is your first cousin.
Yes.
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.
If your brother-in-law is the brother of your wife then his mother is your mother-in-law. If your brother-in-law is the husband of your sister, his mother is not related to you but is your sister's mother-in-law.
Your mother's brother is your uncle and his wife is your aunt.
They have the same mother and different fathers.
Your mother is marring your grandfather? uhh.
If your mother and her brother share the same parents, then her brother's father would be considered your grandfather
Your mother's son is your brother or your half brother.
I have most commonly heard a brother-in-law's mother being referred to as a "mother-in-law"