its only their business, if you want to make it their business. Personally I wouldn't say anything, clients are like customers in a store, they don't need to know your personal life. JMO
Well put valerie - I agree totally with you. Clients don't need to know personal details (especially complicated stuff) about my life.
I suppose nearer the end of everything, you could make a comment in passing that the kids might be around more, but if they are already a part of the daycare at times, I don't think anything needs to be said. Good luck with everything!