oh yes good point!!
I actually used to work for a private school who also had an unlicensed daycare. We had to make sure that the daycare group was completely separate from the kids ages 4+ at all times. And had to keep the same 5 kid minimum, of course. They take that very seriously!!
I have the community hall to myself, luckily. I was told by the MOE that if I wanted to add more kids to my program on certain days, the one way that is allowed, is to have a playgroup that includes parents. So that the kids can participate in our activities (with their parents), but aren't in my sole care.