Here's a question I asked Marjorie Liu on her blog:
Do you feel like its time for Gambit’s biological parents to be revealed?
Gosh…that would be a fun story to write. But would any answer ever be truly satisfying? Maybe the mystery is better.
I agree with her that there is a certain appeal to the mystery, but at some point I think it does need to be addressed. Fabian Nicieza had plans on adressing this matter in his Gambit ongoing, but he clashed with editorial and eventually left Marvel and the series was cancelled. Mike Carey once said that he had a revelation lined up, but couldn't convince anyone that it was a good idea (I vaguely remember him saying that in his proposed story, Gambit didn't have any actual parents--and this was not a good idea IMO). To be truly satisfying, the answer would have to be something that hasn't been implied before (being a Summers, clone of Sinister, Black Womb, etc.) but still fit within whats already been established. I know this would be a very tough undertaking, but I believe it can be done. Unfortunately, it doesn't appear that this issue will be dealt with any time soon, if ever.