"The Stupid Sign
Stupid people should have to wear signs that just say, "I'm Stupid." That way you wouldn't rely on them, would you? You wouldn't ask them anything. It would be like, "Excuse me...oops...never mind, didn't see your sign."
Reminds me of those t-shirts I have seen for sell. One says..."I'M STUPID" and the other one says..."I'M WITH STUPID". Maybe one for your AH and the other for your MIL???