Your sister is your mother.
Your father is your brother.
You all shag one another.
The Inbred family.
Inbred Family
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Explain Bear
Alright listen up, genius. This joke is about inbreeding, which is when closely related people have kids. The joke is that everyone in the family is related to each other in multiple ways, which is a common stereotype about inbred families. You know, kinda like how you're related to everyone in your family tree because you're so far behind on the evolutionary ladder.