Do IL occupancy limits require me to end a MTM lease?

[Tony Vrolyk]

Are there Illinois occupancy limits that would require me to cancel a month-to-month lease if the renter's family grows beyond those limits?

I have a single family home that has been rented by the same family for a little over 2 years. They signed a 1 yr lease that went month-to-month after that. The house is a 3 bed/1 bath with about 1000sf. The couple moved in with 5 kids - so a total of 7 people. The kids were all 8 and under and one of the older ones is there part time. They have since had a baby and I think they are pregnant again. They pay mostly on time and have not caused any serious damage. is there any reason that I can't continue leasing to them based on IL occupancy rules?