- 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 was the father of Queen Sally Acorn in an alternate future version of Mobius, as well as the father-in-law to Sonic, and grandfather to Sonia and Manik Acorn. He was presumbably killed when Mobotropolis was nuked by Dr. Robotnik. (StH: #75, IYF)