J.R.
I would recommend Dr. Phelans 1-2-3 Magic. It worked for me when my 4 and 6 year old became bratty. They are now 8 and 11 and it still works. I will use it with my youngest, 10 mos., when the time comes. Thr trick here is consistancy with both parents and to get any other caregivers involved. It is a very kind approach to discipline. I am also a child development specialist and it fits perfectly with my own philosophy. Lots of my friends have used it with their kids too, with great success. For more information you can go to http://www.parentmagic.com/ . Good luck and happy parenting!