Buggy said but it is not confirmed. I doubt it but you never know.
did i miss something ? when did buggy said that ?
I will try finding the page.
here is the vid
no it was only a filler moment in the anime not manga, and buggy was just so suprised that rayleigh helped him and that luffy has such an infamous family that he thought rayleigh was also his uncle which is not true (keep in mind buggy is a clown)