My mom may have cancer or?

My mom thinks she has cancer. I told her in the past to stop using the microwave. She would heat up food, for a long period of time uncovered when I told her the radioactive waves could harm you in the long run, but no since she is careless, annoying, and doesn't to listen to me this happened. I told her, so many times to be careful of what you eat, and how you handle food. She would also use dirty forks, knifes which she does not wash properly as if she's lazy. I, however, am very clean, and sanitary. Parents think they know everything that is what pisses me off. What can I do now ?