Adult children can be incredibly selfish, if anything disturbs their own lives. When my sister left her husband after 30 years of his selfishness and put-downs, her three older sons were very annoyed because they would no longer be able to use the family home as a free hotel. Only the youngest boy, who was 14, was supportive, even though is life was the most affected. I was lucky - I was only 38 when I got remission and my daughters, who were 14 and 16, said they understood completely. Perhaps daughters react better than sons?
My own view is that you have only one life and it is a pity to spend it with someone who does not make you glad when they come through the door.