My kids know better, and it helped that for a long time, I didn't have a dedicated sewing space, so when I was done with a project, the scissors got put away with everything else.
Hubby, otoh... The worst I've ever seen is paper and thin plastic. But half of my sewing room is now his work-from-home office so I knew it was just a matter of time. I bought a pair of scissors at Lowes, with 2' of plastic chain, and attached *his* scissors to his desk drawer handle. Since they can't go missing, he's not tempted to use mine.
So far, so good...