The Genetic Alliance answers this question wonderfully by stating:
“Family health history is the story of diseases that run in your family. It is one part of the entire history of your family. Along with culture, values, environment, and behaviors, family health history influences the way you live your life. Learning about your family health history can help you make healthy choices: it is a cheap, easy way to improve your own health and the health of your family. Share the information you gather with your healthcare provider to further reduce your risk of disease and create a partnership around your health.”
Therefore, it is very important to learn about and collect your family health history in order to help prevent some diseases and keep you healthy. Your whole family, including your children, can benefit from this knowledge and good practice.
More information about family health history can be found at these links: