Oh no, this is bad, I hope it works out well in the end and they are just getting used to having the money ready for daycare. Some people are so busy they need practice to get things arranged. However, some people will walk all over you if you let them and take advantage of you. So, please put your foot down TODAY and don't take no for an answer. Type a letter of warning and give it to them if necessary to let them know that you will not tolerate any breach of contract. Parents who don't pay on time are in breach of contract and that's grounds for termination. Stand strong!