look at how you react to them maybe you could be calmer and ignore some of it,dont over react, Use the Time out method it does work in most cases where there is a tantrum problem, Place him on a Mat or Chair tell him to saty there yes he will Yell, and come off, do not yell back, quietly place him back on the chair ,over and over, when he is quiet and sorry, give him a big Hug.