I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Nothing in Common Movie plot: Happy-go-lucky advertising executive David Basner (Tom Hanks), who recently got a promotion at his Chicago ad agency, returns to work from a vacation. He is carefree until his parents split up after 36 years of marriage. Out of the blue, he must care for his aging, bitter father Max (Jackie Gleason), as well as support his emotionally fragile mother Lorraine (Eva Marie Saint). Max has also just been fired from his 35-year career in the garment industry. At work, David is developing a commercial for Colonial Airlines, owned by the rich and bullish Andrew Woolridge (Barry Corbin). A successful ad campaign would likely gain David a promotion to partner in his company. David develops a relationship with Woolridge's daughter, no-nonsense Cheryl Ann Wayne (Sela Ward). His father is well aware of David's playboy nature. Asking at one point if his son is in bed with a woman, Max adds: "Anybody you know?" The parents separately each begin to rely more on David, frequently calling him on the phone. His mother needs help moving to a new apartment. His father needs to be driven to an eye doctor. Late one night, David's mother calls to be rescued from a bar after going out on a date, having become frightened when the man tried to kiss her goodnight. At the bar, David's mother confides that his father Max had cheated on her and humiliated her in their marriage. An enraged David goes to confront Max. Their argument ends with David saying: "Tomorrow I'm shooting a commercial about a family who loves each other, who cares about each other. I'm fakin' it." The next day, David is distracted by his problems with his father, affecting his work. As a peace offering, David offers to take Max to a nightclub to hear some of his favored jazz music. While there, David accidentally discovers that his father has been dealing with diabetes and his foot has gangrene. Max must have surgery. Beforehand, he and Lorraine share thoughts about their life together, and she condemns him for his treatment of her. Alone, Max sobs in regret. At the... My question: Who is David's father?
Max