Aside from the contract that you must have so that parents don't walk all over you, you must take charge and not let the parents push you around. If you are getting an uneasy feeling, follow your gut. No amount of money is worth putting up with a family that does not respect you. I would personally tell the lady that the phone call would be disruptful and that you can not accomodate that. Also, you NEED to ask her today for the money she owes you. If she does not bring it tomorrow morning, then you do not care for her children until she does. It is very easy to get taken advantage of in this business, so you need to look out for yourself.