How might the children each contribute a bit more to the father's breaking in my father's sadness?

The children can offer emotional support by spending quality time with their father, actively listening to his concerns, and expressing their love and appreciation for him. They can also help with daily tasks or chores to alleviate some of his responsibilities, and encourage him to seek professional help or counseling if needed. Showing empathy and understanding can go a long way in helping him through his sadness.