I would stick with the original family you signed on. You committed to them when you signed them on and they gave you a deposit. I don't think it would be morally right do back out on them because another family "might" be a good fit. You don't know if your dd and this other girl will get along...some kids are holy terror, some kids just don't mesh well with other kids. It's always a gamble. You don't want your name being dragged through the mud and being known as "the provider who doesn't hold up to her end of commitment". JMO.