So a kid disappeared at a party???? (Monster involved?)

Although it will end a party/sleepover scenario, can you not reset the guest sim child (by way of testingcheats resetsim or MasterController) to return him to a safe place? I think it's hilarious, although sometimes inconvenient to my gameplay, when children check for monsters under the bed and actually find one there but I don't think I've ever seen this happen with overnight guests.