| Gig Young | Hal Henderson |
| Bea Arthur | Bea Vecchio |
| Bonnie Bedelia | Susan Henderson |
| Anne Jackson | Kathy |
| Harry Guardino | Johnny |
| Michael Brandon | Mike Vecchio |
| Richard Castellano | Frank Vecchio |
| Robert Dishy | Jerry |
| Marion Hailey | Brenda |
| Joseph Hindy | Ritchie Vecchio |
| Anthony Holland | Donaldson |
| Diane Keaton | Joan Vecchio |
| Cloris Leachman | Bernice Henderson |
| Morton Marshall | Father Gregory |
| Anne Meara | Wilma |
| Bob Kaliban | Hotel clerk |
| Amy Stiller | Flower girl/Carol |
| Charlotte Jones | Johnny's mother |
As Mike and Susan prepare to wed, the couple's families bring their own relationship troubles to the festivities. Susan's father, Hal, is having an affair, while her older sister, Wilma, can't get her husband to pay attention to her emotional needs. Meanwhile, Mike's brother, Richie, and his wife, Joan, are contemplating a divorce, to the horror of his parents .
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