I agree with not judging someone by their family members 100%!!! Far too many people do that. Both good and bad.
My only opinion was that all of us understand certain things differently because of not only our own experiences, but the experiences in our own families. We have appreciation for things differently, because of what personal knowledge we have.
Like that my father was on the fire department, so I know stories about the job that the average person might be surprised by. Or that one of my brothers is an air traffic controller, so I learned things about the job that I never knew before knowing someone in the job. We all have our own examples like this. If your sister trains dolphins, you could probably tell me stories that would make me say "Wow. I would have never even thought of that."