A.H.
My almost 3 year old son is dealing with a new baby sister (5 mo.) and although he hasn't acted out against her yet....some of his "love" is not exactly gentle. From other moms I have talked to....pushing and taking toys etc is normal for the older child. I think you are doing the right thing with trying to spend more focused, positive time with your son. Even doing everything right (which is totally exhausting)...our children will still act out. I think they have to go through, deal with the sharing of mom and dad....and know that we love them no matter what. You will all get through it.