We don't actually know.
Oda didn't tell us, it was just presumed that Ace already knew.
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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"
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.
There is an episode when naruto meet his dad(the 4th hokage). When Naruto was fighting Pain and when he released the nined-tailed fox he was trap in his own mind and then his dad (Minato) stop him Naruto from getting closer to the fox.Then Later Minato say to Naruto that he was his dad.
well Gingas dad was disguised as the Phionex during most of the first season but then in episode 48 his mask is taken away and it is gingas dad
Well Ginga meets his dad like on episode 45 or 43 either one ,but it definitely on the 40.