My son will be 3 years old in mid-December. He is a very smart little guy and able to tell me days later why a certain punishment happened. ( For example: he can tell me a certain toy was taken away because he was "throwing a fit".) Is he too young to try the ticket method? I know it says 3, and he is close, but we are looking for something drastic to help his behavior. He throws tantrums, whines and cries and grabs from his little sister (age 15 months) regularly. Thank you!