I was letter writer #1 too, except all my children were healthy and normal. My ex-husband told me if I didn't have an abortion with my first one he would leave me, so I said, "There's the door." But he didn't leave. Then I got pregnant again two years later and again he wanted me to have an abortion, although he gave in a little more easily the second time.
but it was me who finally ended the marriage, and he was shocked, just shocked that I would ever leave him. So we divorced and he pretty much divorced the kids as well. He moved out of state and only saw them very occasionally. I tried to do what I could to keep the doors open, but he was especially horrible and hurtful to them when it came time for them to go to college and ask him for some help.
I never said anything against him, re-married a guy who has been a great dad to them and now that they are in their 20's. Their dad is coming around and they are developing a relationship with him. I could not be happier. I want them to have a good relationship if they can and am grateful that the very selfish young man I was once married to has grown up in time to still have some time with them. He even told my son that he really regretted not spending more time with them when they were little. My son told me that for his dad to say this to him was HUGE.
So miracles do happen. It is sad when families don't heal their estrangements before someone dies. Life is too short. LW#4 may never know what really happened, but maybe if she talks to some people who knew and loved her dad, she will be able to understand, forgive and let go. I don't like reading all the letters where someone whose side of the story we have never heard gets called an "a--hole". We are all human, and most people, even Hitler, have other people who care about them, even if we don't.
Love your enemies, or if that is too difficult, at least pray for them.