User blog:Aba1/Rayleigh is Luffy's uncle?

I was watching eps 512 on watchop.com and buggy says that Rayleigh would be Luffy's uncle is this just a wierd translation or is that actually true? I checked his page here and it mentioned nothing and everything here is so quick to be updated it really surprised me.

http://www.watchop.com/watch/one-piece-episode-512-english-subbed/2