But he said at some point in sonic X that Dr. Robotnik was his grandfather. Well I mean look at robotnik in the first sonic show, then look at eggman in sonic X. They look nothing alike. So robotnik must have died at some point then Eggman took over his plans.
Good bye everyone, it's been fun!
Special thanks to ED_, superman4u, and Cross Stinger
Credit for the Siggy goes to shadow slayer