Is it normal to b jealous of ur step daughter?

Hi, my husband and
Myself r fighting ATM. My step daughter loves her dads attention and cuddles. I have a foster child which is difficult, my husband thinks she's horrible and struggles with showing her any affection. I find it hard knowing all he wants to do is hug and enjoy his own child. We had a fight about this as I really resent her coming over now and don't want her here anymore. She's 6 but a real performer so loves attention and an only child as is my foster daughter. My husband said in anger today were not a family. I feel every time we have a fight about this he leaves with his daughter and stays over at his mum and dads( he only has every second weekend and half the (holidays where I look after her) . I feel we're not a real family (when he just wants time just with her and not us all) Anytime with the 2 of them drives me crazy. Hes normally pretty good but its only cause i want time all together, he wud rather have a day to himself with her. I feel like a bitch but at the same time I don't want here here anymore. We r too different. Also Her mums a total bitch and won't Eva pay half the money she owes us 16thousnad but we still have to pay child support which doesn't help and I resent as well, it's all too much