Grandpa's Rule

"Grandpa, do you wish I was a boy?"
"Nah cuz you're my daughter's kid. Your mom could
have all girls and it's all good. But your uncles should
have boys cuz "sons should have boys" is the rule."
"Grandpa, what kind of retarded rule is that?"
"I don't know, I guess it's just my rule. Anyway, your 
mom is good at making girls so she could just stick with
that and make some more girls one of these days."
"Grandpa, don't you think that if she's good at making
girls that she'd be just as good at making boys?"
"I guess we'll just find out one of these days."
"Ha ha ha ha, Grandpa, you're retarded."