I think you’re a great grandparent and gave my son the same thing at 10 plus encouraged my daughter to practice knife skills whenever she can with appropriately sized blades and powerful shears. I can’t imagine nerfing the world for kids that age and then expecting them to learn how to gauge risk appropriately a few years later when they start driving and taking on major decisions. I do understand keeping the knives out of school, but that seems like a simple oversight that should have no police involved unless actual danger occurred.