Esav & cj65 gave you some good advice. Doing what your mother asks you to do, and doing those chores or things to help out without being asked to do them, will go along way to prove you are becoming a responsible adult. Burying them and lying to your mother, in my mind, is seriously bad advice. The ethics you develop and live by are very important. When you give your word, or just say you are going to do something, people should know 100% that you are going to do exactly what you said, barring unforeseen circumstances. Lying to your mother about these inanimate objects, our knives, is simply wrong. Even if she never finds out, you will always know you lied to her, and then it becomes easier to tell lies to anybody. Being truthful is the way to live your life. As others have said, helping her out where she never has to ask you twice to do something. Not complaining, helping other people out freely, sooner or later she will realize that you are becoming an adult, and are a responsible person. She may never like knives, but she will know you are responsible enough to handle them safely.