That's a good idea. Holiday time is no time to start up such a thing. Your family has had quite a year and you should all just relax and enjoy being together for the holidays.

I hope that your father-in-law moves out after Christmas because she'll probably try it again, especially if she doesn't know that anyone suspects her of trying to poison him. It just worries me that he's still within her reach!

I know no one has to say, but I'll do it anyway...just stay close with eyes and ears open.