Interview

[Bookworm]

Sounds like you are doing a good job. Giving a tour of your house and explaining things room by room is a good idea. I do that too.
I think having your husband watch your son during interviews is a great idea. That way you can focus on the family and the potential child. My husband watches mine, but they always end up coming in at the end, which I dont mind. My daughter loves to dote over all the babies (she's 3).
If you are having trouble focusing on the parents, while playing with the child, then I would keep that to a minimum and then schedule a play date during operating hours. That way the parent can see the daycare with the kids in it and the child gets a sense of what is to come.
I always tell potential clients that I do my interviews in the evenings for this very reason. I want to put all my attention on them and then, if they are a good fit, they can come for a play date. I use the initial interview to see how the parents and child are together (do they put them down to play, or hold them etc.).