I am 30 years old and married. My mother-in-law as well as father-in-law had cancer. Mother-in-law had gallbladder cancer, she expired four years ago. Father-in-law had cancer in kidney which is operated but he further has tissues in his lungs which cannot be operated. My question is, is cancer heredity? Is there any chance that my husband might also have the problems? What are the symptoms to check or what precautions can we take?