overbearing in laws

Does anyone else have this problem? My inlaws want to see our 3 year old every single day. They pick her up early from daycare and take her swimming and get her mcdonalds french fries as a treat every afternnon. I should side not that this is my stepdaughter and we have 50-50 custody every other week. They want to see her every day of our week and they think she should be allowed to spend the night one night of our week. I think this is wayyy too much but my husband says they just want to see their grandchild and im overreacting. They want me to act like shes my child and raise her exactly as my own but if she was my daughter i would have tild my MIL to back off already. Its starting to make me CRAZY