You still have your grandchildren learning that the type of behavior was a result of an action, he would have gotten worse, instead its something better. It may take your kids a lifetime to be greatful of Christ because technically they don't deserve it any more equal than the next man who draws a gun on police. It does show ungratuity and the father was sick. It is my place to say that if they didn't get enough benefits from innocence, they shouldn't receive it due to their fathers guilt. If their lives have been ruined, they can apply for that like anyone else. Otherwise it was selfish and I'm sorry you need revenge against.