My daughter is terrified of her cousin

Clarissa
😞 My nephew is a little over 1. He's buck wild like his daddy is. He LOVES my 4 month old daughter. He gets overwhelmed with excitement and swings around. He hits her head with toys. He hits her. He pokes her eyes hard. He pulls and bends her hands. I keep trying to teach him to be gentle and his dad, my brother, laughs. He waits until my daughter is crying before stepping in. It's to the point now if he even reaches for her she looks horrified and cries. It breaks my heart. I don't know what to do IF there's even anything to do.Â