Need some advice how to handle a situation where my 7 yr old son decided to take, open and use a present that was meant for a classmate for her birthday. He knew the present was for his classmate because we went to the store and picked it out together. He simply said, "I forgot". He definitely did it intentionally. Should I not allow him to go to the birthday party because we no longer have a present? Or should I make him come up with the money to buy a new present (although he is only 7, so it won't be so easy). I don't want to let it go so easily.