Before you enter an amusement park or large gathering with your family, take a photo together.
If they get lost, you've now got a detailed description of what they were wearing that you can share with a search party.
More Family Tips
Interview your parents and grandparents.
Ask them their stories, especially related to the family. Once they die, that information does too.
Resist falling for the cultural stigma of living at home being a negative thing.
Lots of cultures around the world live with their parents and even grandparents well into their lives. The "establishment" would rather see you go into debt and struggle so that the familial unit is broken apart. You will be able to save money, improve your family ties, and not worry about having awful random roommates.