The Marriage Fool (1998) on Netflix

Plot summary

For 41 years Frank Walsh was married. Since his wife died he has been grieving and living on his own. A party for local senior citizens brings him into the company of Florence, an outgoing widow. The two begin to date, and her company eases his loneliness and brings joy back into his days as they grow closer. His grown children, though, make their disapproval of Florence clear, and none of them more than his eldest son, Robert, a bachelor who distrusts marriage and sets out to block the budding romance.