There could also be a mentor or an old friend of the father. This person could offer advice or share their own experiences that either support or oppose the father's decision - making process. Their presence could show how the father's choice is not made in isolation but is influenced by the people around him.
The children would surely be main characters as well. Their future, well - being, or dreams could be directly related to the father's choice. For example, if the father is choosing a new place to live, it will impact the children's school, friends, and overall upbringing.
The mother could be an important character. She might have different opinions from the father, which could add conflict and depth to the story.