I need a reliable sitter on the weekends I mean my sitter is very reliable I just feel bad because…

I need a reliable sitter on the weekends I mean my sitter is very reliable I just feel bad because she runs a daycare mon-friday 5-5 and she's sweet enough to offer to watch my son on the weekends the only problem is I feel as if I'm messing up time with her kids and plans she has with them it just makes me feel guilty ,my sons three months and at times can be needy and when she took her kids out to eat she couldn't really enjoy it because he was being whiney till she held him n didn't want to be put down he's not normally like that ,but I still feel as if I'm getting in the way of their family time..my bf mom was supposed to watch him weekends but she's older and has health issues and idk how safe I feel with that idea and he works...I deff don't have reliable friends maybe one but she works so idk I'm scared I'll get kicked out of school if I keep missing or don't have child care on weekends all the time I wish they would understand not everybody has the financial means to have back up child care it crazy expensive and not everybody has a large family its just my kids my dad and brother but he's a deff no go to ask my dads gf but my dad's n her at the age where he can't handle dealing with a baby all day he like to be out and about enjoying stuff (hes raised six kids he deserves that)instead of changing diapers n dealing with a whiney baby.... idk what to do I just wish my sister would move here and stop being back and forth with the decision but she has her own stuff going on that's understandable but she's really the only one I can trust/ rely on...it sucks...