My mom is getting out of rehab on Friday and my grandpa is kicking us out. So therefore we would be homeless and we have no where to go could UMom help with that?

Your mom would need to go to the family housing hub on Monday morning. They are open at 8 am. After she interviews and is on the waitlist, a shelter will call her when they have room for you. If you are living on the streets, as terrible as it is, they will probably call faster. I know it's not great, but the homeless help resources available in Phoenix are few and far between and most of them also seem to be understaffed and inundated by people who need help.

I know my sister is 12 and im 16

Umom only helps familes with children the housing hub is right next door they are your best option or call 211. Community refferal number.