User blog comment:Fintin/Luffy's known and unknown family/@comment-2117107-20100609221439

I think they'll reveal Luffy's grandmother and mother later on in a flashback or something... Really doubt they would have the Will of D though; there can only be so many powerful people in a family, and we haven't heard of any women with the Will of D yet, and since were so far in, I doubt we will find out until well into the future.