as long as he is eating he will eventually go. thats what my family physican told a friend of mine who he was her family doctor too. her child has ADHD and has a big problem with control everything not just bathroom areas. My doctor told us in regards to this boy was to not focus on the act of going or not going. we wouldn't do it otherwise with any other family members so doing it with a child who is refusing to go will not do anything but to emarrass or cause more control problems so instead the trick was focus on the diet. hi fiber (beans and such and plenty of liquid so the child doesnt get constipated or plugged up in his efforts to control his changing world. eventually physical need out weights mental control and the child is soon going on the potty. Also having child size potty chairs or seats that fit on the toilets with a step stool in which the child can have their feet touching while still sitting on the seat reduces fears of falling and so on. Also having a supply of childrens books that stay in the bathroom only for potty time also helps the child with the idea of wanting to be in the bathroom the amount of time it can take to go number 2 for children that don't like to take time out of their play for potty time.