Children under age 10 are usually interested in what's going on. Simple explanations are generally all that's needed. Teens run into a problem here, since it may be happening just when they feel they want to leave the house and demonstrate their independence. Most teens feel compelled to stay home and be with the family member or friend who is afflicted. Guilt is a real concern.
Many kids feel that somehow it's their fault.
They feel they are to blame, and studies have shown that these feelings can last a long time. You need to realize that cancer is not your fault. It happens and you should not feel guilty about it. Share your thoughts with your parents and let them help you understand what breast cancer is really about. It helps when you get to participate in helping the family member who needs you.