Fan Question: In the un-aired pilot, did Cartman have a dad and a sister? What’s up with that?!
Answer: Yes, he did! You can see a brief glimpse of Cartman’s Dad and Sister in the 3rd Act of the Unaired pilot. They don’t have any speaking lines, and they’re only on screen for a few seconds, but they ARE there.
Basically, as with any TV show, the pilot episode is where you test out your characters and plot lines, see what works and what doesn’t. A few scenes (along with this one) didn’t make the cut.
Check out this image: