So, both of my little sisters live with my mom (girl issues), while I still live with my dad. The younger, turning 13 next month, has entertained the idea of moving in with my dad and I pretty much since we left. Back at the apartment, this would've been... a hassle, to say the least, with only 2 bedrooms. When my dad remarried, we moved into a house with more than enough room. My dad told my sister that she could move in with us when she was ready to talk to mom about it herself (not weighing in on whether or not this was the best way to do it), and she did it today. My mom was... a bit dismissive about it, which was what I was worried about, but things seem to be going okay. So now she's moving in with us sometime this summer, and I hope it works out for her.