Nothing in Common (1986)

David Basner is a successful advertising executive who has it all: Money, happiness, and women who want him. Then one day his world falls apart when his mother leaves his father. Now, he must balance his life between his mother, who is happy with her newfound independence, and his father, a recently laid off salesman who is hard-headed, stubborn, and hides a lot from David. Now David must cope with the downfall of his family and his life.