Loving the idea of establishing relationships beforehand. As for Alice I feel as she would sort of get along with Caspen due to the fact they both seem to have narcissistic nature. Since she also plays piano, she'd have some respect for Orpheus. She hates being scolded so the older siblings that have a protective personality she would probably clash with.  

But Alice has a giant room full of clothing and dresses + a piano so she won't mind if her sisters use the room