Oh payment is never late here or I would be super mad. I do have families who pay for 2 weeks at a time and one month at a time to conincide with their paydays. But the payment is due at the end of the first week of care, so by this Friday they will be paying for this week & next week. I would NOT wait until the second week of care. Preferably they should be paying closer to the beginning of the two weeks. I have one family who is paying tomorrow for this week and next week. Put your foot down, change your contract if necessary, but you've learned a lesson that this is something that is not negotiable if a family wants to keep their space in your daycare.