James Evans! He took no guff! Too bad that the producers/network people didn't have the vision to keep him on. Show wasn't the same after he left.
I was disappointed in the last 3 seasons of Fresh Prince, in that uncle Phil seemed to be more relegated to being the butt of jokes, especially fat jokes; you scarcely saw him in a more serious vein after Janet Hubert-Whitten left. On a side note, Aunt Viv seemed similarly under-developed during Daphne Maxwell-Reid's tenure.
Cliff seemed less forgiving of Theo than the girls, for whatever reason, lol.. I don't know if that was his version of "it's going to be tougher on you as a black man out there" routine, or what..
I paid the least attention to Family Matters during its run. My general takeaway is that as Urkel became the fan-favorite character, and writers began writing Urkel-centric episodes, the parents began to matter less. Reginald VelJohnson was certainly a great sport for enduring all the slapstick antics. Apparently JoMarie Payton quit before the last season.