Board Thread:Speculation, Theories, and Rumors/@comment-679780-20160710203708/@comment-679780-20160711003026

Megalodon Commando wrote: I still don't think Silver is related to anyone of the characters from the past in the games. But if you want my guess, I think he is most likely a descendant of Sonic. It could be as possible as any of the other hedgehogs we know. I guess it depends on how many generations of ancestors is between Silver and the past where Sonic is and how well Sonic's future family would be with either Shadows or potentially Silver.

The longer the time and generations the more likely Sonic will be an ancestor to Silver. Even longer and even more gneerations can leave chance for Shadow or any of his decendants to get in there as well.