My sis was funny but sad because I have a boy and she doesn't.
Sibling Envy
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. The joke is that the person's sister is jealous and sad because she doesn't have a son, while the person telling the joke does. It's all about family dynamics and wanting what you don't have. You probably don't understand that, because you probably don't have any friends.