Howatch,
I separated myself from my parents for nearly a decade because of their treatment of me, so I absolutely understand why you had to make the decision you did.
I went on to slowly build a "family of choice," people who I loved and liked and respected, and who felt the same about me. It's a slow process, but is so much more rewarding than beating my head against that brick wall of my parents' denial.
I was far happier without them in my life than with them in it. It's only society that shakes its finger at you and says you're supposed to be heartbroken if you don't have a great relationship with your parents. That noble philosophy never takes into account the sickening damage that toxic, abusive, addicted parents can do to us.
More power to you and your children.