Question

Explain why it can be useful for you and your doctors to know your family's medical history, including information about parents and grandparents.

Answer 1

Answer:

it can be useful because if one of your grandparents had like diabetes or something and you had symptoms of diabetes they will be able to diagnose you and like if it runs in your family

Answer 2

because in case your grandparents have something bad in their medical record, their genes would make it easier to know what you have.
for example

my grandfather has eczema.
a few of my first cousins and i, have severe eczema.