His mom always liked his brother best.
I remember his joke routines about that. One I identified with was his joke about his pet, I think it was a chicken. That it killed Dick's dog. Reason is, that I had a pet duck when I was a kid, but one day my dad's dog killed my duck. The dog just had pups and the duck was trying to eat the dog's food, dog got protective.
Anyway, RIP Tommy Smothers.