Question: Before the airing the episode where Kenny and his brother and sister are sent to a foster home, what animated sitcom extended again until 2016, taking the show to 20 seasons?
Sentence (from "South Park (season 15)"): The fifteenth season of the American animated sitcom "South Park" began airing on Comedy Central on April 27, 2011 and ended on November 16, 2011.
Relevant evidence: No