Think back over the past few weeks. Has your husband upset any one of the kitty butts reciently? Could you think of anything at all that could have upset them? (changing foods, rutine etc) John said and I tend to agree that cats can hold a pretty big grudge, and a sign of that is targeting the person of thier wrath with pee. I've seen cats get mad at someone and target thier things exclusively, shoes, bed you name it they'll hit it!

Also, have you had any contact with any other cats reciently? Sometimes peeing can be a teritorial issue, so can inapropriate poo. (I swear this is the only forum I can say "inapropriate poo" and not get a wierd look). Have you done an extensive cleaning reciently? Cats rely on thier noses quite a bit and sometimes an new (or extremely clean, like cleaning product clean) smell can upset cats. My cats got majorly upset once after a huge cleaning and trust me they let me know!!!

Pinpointing which cat is most affected by recient events should help you find the culprit.

Hope that helps a little. Good luck with the issue!