I see they are hiding under what seems to be a sofa. I share this piece of information in case it ever helps anyone (I attended a canine and feline first aid course last year) be extremely careful when opening a sofa bed when people are home as cats tend to hide underneath because their tail could get caught in the mechanism with very nasty consequences. I don't know if it'll be of help to anyone but I figured it was worth a shot if it can help prevent injuries on even just a single cat.