According to Sheldon, Carl was killed by a badger [KBB] and the last words he ever spoke to Sheldon and his family were "I think that there is a badger in our chimney. Hand me that flashlight."
In the Young Sheldon episode "Cape Canaveral, Schrödinger's Cat, and Cyndi Lauper's Hair" it is mentioned by Mary Cooper that her siblings are Charlene and Edward. It is possible that Charlene later becomes Carl.
- Father: Pop-pop
- Mother: Meemaw
- Sister: Mary Cooper
- Brother: Edward
- Brother-in-law: George Cooper Sr.
- Nephews: Sheldon Cooper, George Cooper Jr.
- Niece: Missy Cooper