We're off to a bad start today. After two time outs for Max, for being rude to both of his brothers, and the message still not sinking in, I decided to try sentences. I told him "I want you to write, 20 times, 'I will be nice to my brothers', and then bring it to me."
And this is what he brought to me. Apparently I didn't annunciate the "N" in nice very well. Other than that, he clearly followed my directions. After we had a talk about what I really meant, and a quick spelling lesson (n-i-c-e) I settled for fifteen sentences, and now ... hoping for a good rest of the day.