- You may be looking for Maximillian Acorn from Mobius Prime. Or you may be looking for the Mobius: X Years Later version, Maximillian Acorn (MxYL).
Maximillian Acorn is the father of Sally Acorn in the alternate future reality. He is also the father-in-law to Sonic, as well as the grandfather of Sonia and Manik Acorn. He was presumbably killed when Mobotropolis was nuked by their universe's Dr. Robotnik. (StH: #75, IYF)