Hi there.
Has your son ALWALYS been this bad, because those medications scare me. When I saw the medications, especially with that Zoloft dose, I thought, "Wow!" If there is any chance that he has been misdiagnosed and actually has a mood disorder, all I can say is those two medications will activate him beyond him being able to reign himself in. ONE of those medications would make me out-of-control. Two of them...just whoa.
Please remember that your family--mom, aunts, cousins--should not matter as much as your child. Your immediate family is different, but I'd get a second opinion about the laundry list of diagnosis. because the medications clearly are not working so it's likely that the diagnosis. is wrong. I'd see a neuropsychologist. That is who finally straightened out our "multiple diagnosis." problem and got my son on the right track. They do a different kind of intensive evaluations that others don't do.
You can't just "get rid" of your son, and, in my opinion, you probably just want him to behave in a tolerable way--I'd get a fresh evaluation from a different professional, especially if there are any sort of mood disorders or substance abuse on either side of the family tree. Not all hyper kids have ADHD, but most will be dxd. with ADHD, and it takes careful testing to figure out the big picture. Try to remember he's sick and keeping looking for help, just as you would if he had an infection that would not go away.
I wish you luck.