running away in a way

So me and my boyfriend don't want to be at my house so we were gonna go to my grandmas. My grandma is willing to take us in and she's stable to provide for us. I don't want to be home my mother doesn't make me feel wanted or safe. Can I still get brought back home if she calls the cops? I'm 17 and turn 18 in June and I can't wait. What do I do??