When I started my daycare both my husband and myself had our police checks done. Yes, they are out of date and I would have no problem updating the certificate should it be a deal breaker if I don't for a prospective client. I feel it is a part of our documentation as a daycare and should thereby be a business expense for us.
I haven't had a parent ask about a police check, though I do tell them we have had them done when we opened. It is funny no one has asked to see it.
So I wouldn't be concerned about your clients asking for the check for your hubby. They are just crossing their T's and dotting their I's before they come on board. As for you? You are busy running a daycare, who has the time to commit a felony? LOL