Well we already know Luffy isn't Roger's son, so you don't have to freak out about it. :P

I do think that the foreshadowing in that page suggests a deeper connection, though. Even following the idea of "lost history", maybe, as poops said, D was a clan. Maybe D was the race of people who were wiped out during the blank era.

That would bring even deeper meaning to Roger's role as the catalyst to the pirate era.