Played by Alan Arkin. He forms a deep, platonic bond with a young waitress (Amanda Seyfried) at his local diner.
Played by John Goodman and Diane Keaton. They are secretly planning to divorce after the holidays but want one last "perfect" family Christmas.
In a surprising twist, the entire movie is narrated by the family dog, Rags (voiced by Steve Martin). Community Consensus
If you're looking for a quick breakdown of Love the Coopers (2015), here’s a "useful post" summary to help you decide if it's worth your time this holiday season.

Played by Alan Arkin. He forms a deep, platonic bond with a young waitress (Amanda Seyfried) at his local diner.
Played by John Goodman and Diane Keaton. They are secretly planning to divorce after the holidays but want one last "perfect" family Christmas. Love the Coopers
In a surprising twist, the entire movie is narrated by the family dog, Rags (voiced by Steve Martin). Community Consensus Played by Alan Arkin
If you're looking for a quick breakdown of Love the Coopers (2015), here’s a "useful post" summary to help you decide if it's worth your time this holiday season. Love the Coopers