When I go into doctor's offices, usually one of the forms they ask me to fill out has to do with family medical history. I am fortunate to have extensive knowledge of my family medical history. I'm not sure if that's unique to my family, but it might be. Many people (i.e., not LDS people) don't always know the names of their great-grandparents, much less some of the diseases they suffered from.
Some time ago, one of my grandmothers sent out a genealogy chart with dates of family members (births and deaths) and what they died from. It was pretty amazing, if you think about it.
Fortunately (or unfortunately for the doctor), that also means that I bring up this knowledge in the appointment. And, I have almost all of the diseases at some point in my family history on one or both sides. Allergies, diabetes, cancer, high blood pressure, glaucoma, Alzheimers, high cholesterol, etc. etc. Most doctors will remind me that usually, one's parents and siblings are the most important factors. One's paternal great-grandmother's health history is useful, but not as useful. And in the end, diseases aren't governed solely by our genetics, there are many other factors that might be involved.
Predictably, the doctors ask about the ages when various family members were diagnosed...it's usually over the age of 50 and for many, over the age of 75. So many family members have been fortunate enough to live long, healthy, productive lives.
In other words, knowing that someone had gall bladder problems in their early 80s...it's hard to say if this is an instance where information is useful, or immaterial.