My family doesn't even know 10% of what I experience and have experienced, so I can't say they're all that supportive. Most of us get along very well but we are not an intimate and share feelings kind of family.
As for how my trauma has changed my relationships with my family members, I guess it has made me view my parents even less as parents and more as just some people I care about who really love me that I live with. I never saw them as protective or emotionally supportive figures, and they weren't really there for me throughout anything difficult in my life. Comfort doesn't really happen in my house either, it's always a suck it up or else deal with it privately kind of set up. How it changed my relationship with my siblings, I'm probably about 1000x more protective of them now and desperately want to prevent the things that I went through happening to them.