My mom is addicted to the internet and has a mental illness. I am now 27 and have a life of my own, but it still hurts. It hurt even more when I was 15 and saw it going on in front of me. There is nothing more that I wish, than if my dad could have done exactly what you are planning to do. To this day I ask myself, "Why didn't he just do something drastic?" Our family literally fell apart. One day your kids will thank you for what you did. And you will feel better for it, too.