There we are, the first few major events in the timeline proper. Obviously S1, CD, and S2 are missing. The story began with S3&K's arc with the gaps filled in later for Sonic, Amy, and Tails' stories. To keep things short for that here though, Sonic brought them both back to South Island to live with him and Uncle Chuck cause they needed help and had no one else to turn to when he met them, they're essentially family now.