If you are talking about in Sonic X then yes
Sonic Underground - 1999 A Hedgehog's Home is Her Castle 1-14 was released on: USA: 13 December 1999
In the episode Tails' new home, sonic has a flashback showing how he met Tails, but it is unknown when.
Adventures of Sonic the Hedgehog - 1993 Tails' New Home 1-16 was released on: USA: 7 September 1993
That's way too long to list here I suggest you go to Sonic wiki home page area for characters.
Sally is Sonic's current girlfriend, back from Knothole Village. When Sonic and Tails arrive their old home, they meet her and Bunnie.
Only if the kids have the volume up too loud I'm afraid. wow that made me laugh, but sadly, no.
they never show but they show when sonic meets tails, but you can go to Google and go to videos and write how did sonic meet Amy and mabie they show ya.
Move back home
As of November 7, 2011, there is no Sonic Heroes 2. Sonic Heroes was released in North America for GameCube, Playstation 2 and Xbox in January 2004. It was followed later the same year by Sonic Advance 3 on Game Boy Advance, and the following holiday season by Shadow the Hedgehog, a spin-off of sorts, for home consoles. This year's release will be Sonic Generations.
His usual home is Mobius. I don't know what state, though. I mean I don't know what state, because I only know The United States states.
Sonic and friends lived on a fantasy version of our Earth. Some of the japanese classic game manuals already confirmed it. Their home planet is mostly mistakened to be a parallel version of Earth(Sonic X), Mobius(DIC and Archie), and sometimes planet Freedom(Sonic the Movie)
Chris assumingly went back to his home planet.