Not a baby

FATHER:What are you going to do this evening, Jill?
JILL:I'm going to meet some friends, Dad.
FATHER:You mustn't come home late. You must be home at half past ten.
JILL:I can't get home so early, Dad!
JILL:Can I have the key to the front door, please?
FATHER:No, you can't.
MOTHER:Jill's eighteen years old, Tom. She's not a baby. Give her the key. She always comes home early.
FATHER:Oh, all right!
FATHER:Here you are. But you mustn't come home after a quarter past eleven. Do you hear?
JILL:Yes, Dad.
JILL:Thanks, Mum.
MOTHER:That's all right. Goodbye. Enjoy yourself!
JILL:We always enjoy ourselves, Mum. Bye-bye.