I can see the parents being very upset about paying a holding fee if you are not going to keep them. I know you have a 30 day trial but if you terminate during that trial period do you return the holding fee? I can see them thinking that you are very dishonest if you don't. There are plenty of online places to advertise and if you think about it why would your current parents be looking at childcare ads online unless they were looking for a new caregiver so that is probably a pretty safe place to advertise. Same thing for the new family. If they are looking online at ads then it is also possible they are looking to pull out too. You could also be honest with your current parents and say that you are having second thoughts. 30 days takes you to July. What if you advertised for August start date and then non of the families need to know who is leaving and the new family will just think it is another child. When it has been confirmed be it Aug, Sept, Oct whatever you can terminate the first family accordingly. It may mean dealing with them for longer than you wanted to but it will also help you save face.