What Would I Call My Grandfather’s Brother?
Your grandfather’s brother is your great-uncle. In some countries, he may also be called a granduncle.
Similarly, your grandfather’s sister is your great-aunt or grandaunt, and you are her great-nephew (grandnephew) or great-niece (grandniece). A great-aunt or great-uncle is also your mother’s or father’s aunt or uncle. Great-uncles, great-aunts, great-nephews and great-nieces are part of the immediate extended family in most genealogy structures.
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