Nature vs Nurture

Where does this anxiety come from? Did I inherit it? Are my kids doomed to the same fate? Or was it my environment growing up? Maybe if I give my kids a better childhood than I had, they won't have to deal with these kinds of problems. My family is insane, and I'm often embarrassed when someone has to deal with any of them. I don't apologize for them anymore. I just try to warn people in advance, but more often than not most people think I may be exaggerating. But, then there's always that one experience when they see what I was warning them about. Anyone that's known me for any length of time has found out that my family is absolutely nuts. And, I'm probably the most level headed and sane out of all of them. I'm certainly the only one that has kept a job and is doing ok for the most part. I've stopped communication with my sister a few years back. She's a meth addict, and uses people on a professional level. My mom has no self control and will throw tantrums in public. My dad was a suicide. I could mention my sister's kids, but I sympathize with them. So, I don't know. Having all consuming anxiety isn't so bad compared to the rest of my family. How much of it will get passed on to my kids, and their kids, and so on? I guess time will tell.