So I have an issue but idk

Well, my fiancé and I have a daughter 7 months old, I'm a stay at home mom and my fiancé works. Well, since she was 4 months my mom has had her on the weekends not every weekend but almost every weekend. Anyways my mom is kinda petty and gets upset when I tell her I'm keeping our daughter for the weekend and stuff, but my dad he's not doing so well but he doesn't show it. Well my disgusts has pretty much been his world and he loves and adores her so much he said it reminds him of me when I was first born and it motivates him to eat right, even exercises even if it's just taking a walk with her in her stroller or going to the store or going to the park with her and my mom. I'm glad she makes them super happy, but I don't want to hurt my dad's and moms feelings they also buy a lot of things for her but my fiancé and I are doing more than okay with bills so they don't have to help but the do anyways also when my fiancé and I weren't doing so good they helped us out so i don't want to sound mean or harsh I just wanna spend weekends as a family or they could even join in with us if they wanted I just don't know how to I approach her