Scenario 1:
Daughter: I want something to eat.
Mom: I beg your pardon?
Daughter: Can I have something to eat?

Mom: Pardon?
Daughter: Please may I have something to eat?

Scenario 2:
Mom: Please will you tidy your room up?
5 minutes pass.
Mom: I asked you to tidy your room up.
5 more minutes pass.
Mom: Tidy. Your. Room. The. Fuck. Up. NOW.

Kids work their way up to politeness. Parents work their way down from it.