There isn't much to write a massive comment on, but, I can tell that the problem that will arise will be that, they find out the real reason she ran away, and they either decide to leave her or for a couple chapters its going to be sad and things will return to normal, as Novels like this happen. I like the fact that all 3 of the siblings are obsessive.
I Became a Sitter for the Obsessive Villains