I'm not sure what to do.

I'm due at the end of June and my mom is coming for 3 wks right before I have baby and until almost middle of July. My dad step mom and half sister all want to come out literally a week after my mom leaves but I kinda want a break. I'll have 6 people in my house. I'm scared to tell my dad that I don't really want them to come out pretty much after my mom leaves but I feel like I'm being mean because it's their grandson. I wouldn't mind them coming out later.