Der Geburtstag und das Begräbnis

A doctor saves his father-in-law from a crash, letting his own father die. He misses the funeral to celebrate the man who caused it. At the grave, his mother reveals the truth: the father-in-law was drunk driving, and his wife covered it up. He divorces, quits his job, and returns home. Can a lifetime of devotion undo a single fatal choice?