Who is Father from the story, Kaddish for a Child Not Born?

The narrator's parents are divorced by the time he is five years old and his mother disappears permanently from his life at that point. He attends a boarding school from age five until he is ten years old. After he turns ten, his father takes over his education. During this time the narrator discovers how different he and his father are and how complicated their relationship is. He does not believe in or accept his father's authority and pities him that he cannot truly exert the authority he assumes he has. The narrator believes that he loves his father but also feels that his love is not sufficient.