Hello, Kids fall and have accidents is a normal. That alone is not a basis for a lawsuit. ADD or ADHD, to the extent they exist, is not, alone, a reason to deny recreational activities and if it was, it is likely a joint parent/school decision. With respect to how the arm was treated, again, it is a painful injury and process. Some pain is reflective of the healing process and the mere fact that it is a broken bone. The painful experience is not grounds for a lawsuit. See a personal injury lawyer, and get an independent medical opinion.