I need some help whit my son plz....!???

this is a good learning experience for your child. he needs to learn that he can't have other people's things, that sometimes he must wait for what he wants, etc. just don't take the toy from the other kid and give it to your kid! comfort your child and redirect his attention. then when the toy becomes available, remind him he wanted it and see if it still holds the same appeal it once did.