So my son and daughter are two years apart from each other. And my son who is 3 always hits her or kick her..I tried talking to him about it..telling him that you don’t hit sister. I even tried putting him on time out for smacking her in the face once. And that didn’t not help at all. To this day he just keeps hurting her. There is some days that he is totally nice to her and plays with her...I just don’t know what else to do to make him understand that he can’t hit her. He is totally friendly with other kids but not her and my husband and I don’t ignore him at all. We pay attention to them both..we treat them both the same and everything. I just need advice before I become more stressful with this.