honestly, that's not been answered yet. we know Ace is his brother, Garp's his grandad, and Dragons' his dad. If you thought of this question with the appearance of Hancock, she's definitely not his mom-- she's in love with Luffy, so that would be just weird if she were his mom.
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We don't actually know. Oda didn't tell us, it was just presumed that Ace already knew.
no it his uncleluffys dad is monkey d. dragon. he might be his uncle.Strong points that they may be related:Ace was adopted by the "monkey family" (luffy,dragon,garp)Ace is Gol D. Roger son, (not Gold Roger or Gold D. Roger)"Will of D"
Who is Pam Tillis's mother
They never say who Neji's mother is
Her mother is not famous.