User blog comment:PUNCHURPREGNANT/Gray and Silver Predictions/@comment-24550270-20140607081046/@comment-24339224-20140609044500

this may be what you just said, but also, they have similar appearance, similar magic/curse (I haven't entirely gotten the curse thing into my head yet), names being similar colors... My first idea was father and son, but I am leaning more towards future self somehow. or, plot twist, it is grays son from the future, who went into the past to join tartarus. sure, it's a little shaky, but look at Ultear and Ur. Ultear hated her mother enough to want to kill her. Silver, when natsu mentioned him being similar to gray, froze natsu instantly, saying "Don't say that disgusting name." and smiling when he got the chance to fight gray. seems like an ultear and ur scenario. Sorry for the long paragraph