C.T.
From reading your SWH: I would try a child psychiatrist again but get someone who is a female and who specializes in teens. If your son tends to butt heads with males (my son is very similar...very headstrong) then a male therapist was not the right choice. My son's therapist works with him on making the right choices...that he is old enough to take responsibility for certain things and she has him come up with his own plan for doing things. She also works with him on how to not have huge outbursts, to not get so angry/upset and the right way to handle things in life when they are not going his way. He has learned so much from her and he is very bonded with her...they are good friends and he thinks she's cool. If the mess is candy wrappers, etc....how about having him do a nightly trash pick up before bed? My son does his nightly pick up when I tell him it's bedtime because cups, wrappers, plates pile up. It really sounds like you and he (and grandpa) are not very close. I would work on that first and foremost. He has to know that you like him as a person. Does he make you laugh? Does he amaze you with is ability to xxx on his favorite video game? Can you read a book he thinks is cool? Is his ability to keep a beat and his passion for music awesome (or sports, or drawing, or ???). My son's therapist also taught me not to take his bad behavior personally. To let go. To not worry so much. It was hard for me but my son and I enjoy each other so much more now. We are not arguing all the time. A good friend also has suggested a family therapist...so you all take turns meeting with this person. That might help you too. Just something to consider.
My mom gave up with my brother's room and just kept the door closed. She was very surprised the first time she visited him in college and he kept his room neat and clean! He was a total slob growing up, but completely changed once he moved out and took responsibility for himself! I personally would not want to have a constant battle and would just have a "clean up day" every now and then where you motivate him to clean his room with the promise of getting to do something he really wants to do that day (get on the computer with friends, invite a friend over, go to friend's house). As for the lying and taking change...I'm no child therapist but is his living with you new? Has his life been disrupted? It's hard to be 12. I'd let him know that this is disappointing and that you expect better from him because you know he can do better. But then I would drop it and not harp on it. Does he take change because he needs money for specific things? Can he earn an allowance at home or start a job doing things like dog walking, car washing, etc? I would work on bonding with him. Listen to him. Let him share his favorite music or video game with you...have him teach you how to play some video games. Ask him about what he is interested in. Show interest! Go do things that he thinks are cool. Don't give him the opportunity to lie. If he keeps doing it perhaps he should see a child psychiatrist about it. Therapy has been very helpful for our son.