The Corrections by Jonathan Franzen

The Lamberts – Enid, Alfred and their three grown-up children – are a troubled family living in a troubled age. After fifty years as a wife and mother, Enid is ready to have some fun, but her husband Alfred is losing his mind to Parkinson’s.

As his condition worsens, and the Lamberts are forced to face the long-buried secrets and failures that haunt them, Enid sets her heart on gathering everyone together for one last family Christmas.