姑父 refers to one's father's sister's husband.
Think of your father's sister as a bridge, and your uncle is the person standing on the other side of the bridge.
姨妈 (yímā): One's mother's sister.
阿姨 (āyí): A general term for aunt or any woman who is older than you but not old enough to be called "grandma."
叔叔 (shūshu): One's father's younger brother.
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