>>140328579He's the child of divorcees, it's possible his mom re-married and he has very complicated feelings about his Father and Stepfather.
Could also be he feels making the father kind of an asshat make people more sympathetic to Knuckles.
With Max, the man has gone through all manner of bullshit. He spent actual years of his life as a brainwashed war lord of a mindfuck alternate dimension, then came home and started calcifying into living Chaos Emerald, and all of it as a response of him trusting the wrong man at the wrong time. So he turned mean. He distrusts everyone, sees betrayal everywhere, even in his most trustworthy and loyal subjects, even in family. Frankly, other Kings in situations similar to him have turned a hell of a lot meaner, put a coin in me about the Sword of Damocles some thread.