How would you handle spoilt/stubborn teenagers?

That's a fantastic question!! If you get an answer, let me know, my teenage son is driving me crazy! He's bossy and arrogant and incredibly mean to his little sisters. I'm completely lost, nothing seems to be working. I've actually gotten him a therapist and brought in a home based therapy group to help me deal with him. Maybe your friend should consider something like that. If not to change him, then to help your friend deal with him. I avoided doing anything like that for a long time, but I just got to the end of my rope.