For some reason my daughters love to use my decent knives to cut food on top of ceramic plates and they frequently get tomato crushing dull. I bought an overpri

For some reason my daughters love to use my decent knives to cut food on top of ceramic plates and they frequently get tomato crushing dull. I bought an overpriced sharpener that had excellent reviews (from actual knife sharpeners not just Amazon customer reviews) that I think may be a counterfeit from Amazon. I think I just need to learn to sharpen well with stones and hide my knives better.