Relieved yet still troubled...

I'm 29, own my home, work to care for myself and my 9yo. My parents (which are divorced) moved in with me on desperate occasions and then my sister moved in last May with her 4 children. Needless to say I am overwhelmed and have more than a house full. I got back with my daughters father and we have decided to have another baby we are 6 weeks pregnant. I broke the news to my family and they are less than thrilled. Now he doesn't live with me but wants to blend households... How to clear my house without being a bad daughter/sibling???