Even though our daughter was an adult, the destruction of our marriage and the disappearance of the man she knew as her dad affected her deeply.
In discussion with what she wants, we include him in family events, Christmas, beach vacations in the winter, he stays at my home when they visit in the summer.
We have managed to remain a "family" in spite of his crisis. It is the best thing for our family.
My daughter and I are open about who is is, the changes in him and she is very aware of his "weirdness".
I attended a state CASA conference yesterday and was reminded again of how important it is to maintain some kind of contact with birth parents.
I also attended a really good session of addiction and the difference in brain chemistry, specifically with regard to the levels of dopamine in people who are addicted, depressed and even those who have ADHD. Due to low levels of dopamine, people afflicted will search for anything that gives them the feeling that high levels of dopamine gives....in many cases, the MLCer engages in an affair, spends money lavishly, gambles, uses drugs and alcohol, does all kinds of things they would not have done prior to their crisis to attain that "high".
This is a biological fact for people with low levels of dopamine which happens...also with a genetic component that passes along these genes.
If you are ok with his coming and going then you might be able to facilitate a place where healing can occur and your kids can benefit from having some association with their father, especially if they understand the pathology that is going on.