has he been tested for adhd?I bet he has tons of energy so try taking him to the playground, a little baseball league, some are free, if he drains all that energy he has into sports he will forget about hitting his little brother, also ask him if he wants to help you cook, something easy like a sandwich, put the waffles in the toaster, pouring the cereal in the bowl, things like that will help him to be patient, helpful, always tell him, good job, you're an awesome helper, things like that, he'll feel more like a big kid and little by little explain how he can do things his brothers can't, because they're little, and how he has to help them and take care of them, always reward him with hugs, kisses and thank yous ...good luck <3
I understand u my 5 yr old its almost like ur 5yr old......sometimes time out might work if it doesnt I mean try to scare him with what scares him the most but us as single moms have to keep patient iam the same way single mother of two on to my 3rd child now
I she like this only at home, it is possible he feels left out and is jealous of his siblings , maybe some extra attention for him, if Dad is around get him playing sports, ball games and having fun so he feels equally special ....
Is he in any day care or preschool yet? If so, does he have the same problems there?