My Brother Jonathan (1948)

Doctor Jonathan Dakers in flashback tells his son Tony - a World War II veteran - about his life, dating from the 1900s. Whilst a medical student, he meets and falls for Edie. Before they can marry, Jonathan's father dies and he sacrifices his further career so his brother Harold can stay in college. When Jonathan is delayed from reuniting with Edie years later, Harold and Edie fall in love during his absence. Complications arise with Edie's engagement to Harold after he is killed in World War I while she is carrying his child. Edie dies in childbirth and Jonathan promises to raise the child, Tony, as his own son, and he and Rachel get married.