User blog comment:IamJakuhoRaikoben/Chapter 366: 1000 Souls, Review./@comment-4449950-20140111003333/@comment-7418318-20140111094217

@FTGM No I didn't. Because it'd be damn hard (and round-about, not to mention hard to swollow) to explain how Layla and Jude lost their firstborn and how later Jude with all his money and connections and specifically looking into Fairy Tail due to Lucy being there would have not noticed that Natsu was really his son. Also where would Natsu have gotten the pink hair?

And I doubt Mashima would want to upset the NaLu fans.

@B214: I once theoriezed that Silver might be Gray's ancestor, but at least one generation further apart (grandfather or great-grandfather, ect...).