https://www.southparkzone.com/episodes/113/Cartmans-Mom-is-a-Dirty-Slut.html
https://www.southparkzone.com/episodes/202/Cartmans-Mom-is-Still-a-Dirty-Slut.html
When does she decide to tell eric the truth?
https://www.southparkstudios.com/clips/103398/kennys-sacrifice