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Your grandfather.
Your father's brother is your uncle. Your Grandfather's brother is your great uncle. Your Great Grandfather's brother is your great great uncle.
If your mother and her brother share the same parents, then her brother's father would be considered your grandfather
Your grandfather's son is either your father or your uncle. Your daughter's grandfather is your father. or your father-in-law.So your daughter's grandfather is your grandfather's son or a brother if there is more tha one son, or, as your father-in-law, is not related to your grandfather's son at all.
Your Grandad! yeah your grandfather
Your father's brother's son is your first cousin. Your father's brother's grandson is your first cousin, once removed.
Your daughter's grandfather's brother's son is her mother's or father's first cousin and her first cousin, once removed.
She is your great aunt by marriage. She could also be your grandmother, if your father's aunt's brother is your grandfather.
Your mother's husband is your father. His father-in-law is your mother's father, your grandfather. Your grandfather's son is your mother's brother, and your uncle. Your uncle's daughter is your first cousin.
Great great grandfather
Brother, uncle, father, grandfather, nephew.
Your mother's husband is your father. His father-in-law is your mother's father, your grandfather. Your grandfather's son is your mother's brother, and your uncle. Your uncle's daughter is your first cousin.