YOU READ IT HERE FIRST, GANG. THE FATHER OF ERIC CARTMAN IS:
CHEF
--------------------------- And why? It's obvious. Here's the official explanation.
In the episode entitled "Damien", remember when Chef arrives at Eric's birthday party? He is shown to Mrs. Cartman's chili, and he says, "Mmm, that's my kind of chili", as he stares at Mrs. Cartman. When all is said and done, Chef is the father.
I am proud to release this information to you. But PLEASE, keep it private for those who still want to know.