You need a clock like Molly Weasely's. It has a hand for each family member, pointing out when they are traveling, at school, at home, and so forth.
Of course, there's also a position for the hands to point to "Mortal Peril". That's probably just for Anoreth and Vlad.
It would be helpful.
I’d like a version with more detail, though: it should specify “In bed,” or “In the bathroom,” to help find the teens, and “At the playground,” “At the corner,” or “At X’s house” to help find Frank.