When starting a new child I do let the parents come up to 2 times to visit. I ask them to come first thing in the morning and to stay no more than 45-60 minutes. They want to see the other children and see how their child interacts and I can understand that. I let my current parents know that it is going to happen and they are all ok with it since they had their turn when they started. After this the child comes alone and there is a payment involved. By having them come early - use the excuse that it gives them a chance to also practice the new morning routine they are there, played and gone and it barely interferes with your day. Because the parent is there it doesn't put you over in numbers either. Remember that unless your space is already empty you aren't allowed to have the child come by themselves.