Alzheimer's, djt got even with Frederick Sr. by humiliating and dominating him when he was weakened and no longer able to defend himself or fight back. djt took command of his father's fortune and set himself up with a huge majority of it so that his surviving siblings got only a tiny portion of their rightful inheritance. He also took over his mother's share and set about controlling her too.

Vengeance and a need to dominate others has always ruled his life. Now he is totally losing his marbles, just as his father ultimately did.