I have talked too him he says well you know how she is her grandparents and mom have her that way
There was 5 years between my sister and I. My mom always treated me like I was a huge help with the baby and that she couldn't do it without me. I think that helped quite a bit. I loved the fact that the baby needed big sister because she couldn't do anything for herself yet.
That's exactly how my boyfriends two kids are. A boy who's 5 and a 2 year old little girl. But we have them full time. They don't even want me to have my baby girl.. So I know how it feels..
You need to have a talk with him about her actions because there has to be boundaries. Did he prepare her for the baby's arrival ? He has to make that step to stop the jealousy.