This patient support community is for discussions relating to the challenges of parenting
teens (age 12-17), including physical, emotional, and cognitive development, handling peer pressure, activities & sports, choosing a college, and relationships.
Well, maybe it is time to see the family doctor and ask for a referral to a pediatrictic mental health specialist. Perhaps it is time to change his medication or perhaps the diagnosis of ADHD is incorrect or perhaps your son suffers from a personality or mood disorder or perhaps someone else on this site might have insight into this behaviour .... whatever. Before you can find the solution, you need to discover the problem. I wish you luck in your journey and search ....
At home, make sure he has clear boundaries and that you constantly reinforce over and over and over again, you shouldn't have to walk on eggshells when he's around otherwise your handing the power over to him. I did read from your post that he will not pick on his brother because he knows he will not take it, this is exactly how it has to be with you also, as the parent. Talk with your partner and maybe implement some things you may not have tried so far, you have to regain the position of authority. I always say in my posts its easy to sit back and tell people what they should do, i understand its easier said than done! good luck, all the best :)