But he and Catherine had a son who died as an infant, and he had at least one bastard son, the Duke of Earl, died as a small child from ‘sweating sickness’ and of course his sickly legitimate son Edward who died young.
He had son genes, just not very good ones apparently. I think it was from getting speared repeatedly whilst jousting.
Some time ago I observed that we Americans make fun of red necks for supposedly acting the way that royals were once well known for. Or, to put it another way, if you think a family reunion is a good place to look for a bride ... you might be a king.
Gotta figure that occasionally had an effect despite the often markedly superior diet royals had.