Have you seen the episode Scott Tennorman must die?
well apparently Scotts dad Jack Tennormen is Cartmans dad.
But Cartman fed him to Scott in a chilli that's why we don't see him.
If you don't believe me, watch season 14 '201'
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OK this might be a little crazy and since you did not watch episode 201 but it turns out Scott tenorman father was cartmans dad! which means Scott is his half brother! AND cartman killed his own father then grounded him into chili! how sad lol hope this helps! :)
His father is his 'mother', Liane Cartman, who is a hermaphrodite. His birth mother is unknown although in the South Park movie it is suggested that she is Canadian.
Cartman's dad is his mom, she's a hermaphrodite.
Later in the series it was Scott Tatermans dad who was Cartman's Dad. He killed his own Father. He made him into chili.
Cartman's mom is his dad, turns out she has both reproductive organs, it was discovered in the earlier seasons of southpark, it was a two part story