Oh tough one for sure - not sure how I would handle this to be honest cause I am a sucker for having made a commitment and following it through as long as they are paying on time and following the rules?
However you kinda have to 'terminate' them if you have now promised space to 4 day a week family - not sure how you do that without 'bad feelings' on the Family A fault though - except perhaps cross your fingers that this is what she wanted TOO?

