The Keatons are surprised, but delighted, when Elyse's Aunt Rosemary shows up for a visit. Although Rosemary claims to have sent a letter and spoken with Mallory about her arrival, the mix-up is quickly forgotten as the family warmly welcomes their loving and favorite aunt.

Rosemary charms the Keatons with her wit, humor and wonderful family stories. But soon, she begins to act strangely to simple questions, and Elyse starts to worry when Rosemary begins repeating things that have just been discussed. Finally, Rosemary admits that she has been having trouble with her memory and has no idea how she even got to the Keaton home.

A trip to the doctor confirms beyond any doubt that Rosemary has Alzheimer's disease, which will get progressively worse and ultimately, render her helpless. Stunned by this tragic news, Rosemary nevertheless refuses to despair, determined to make the most of the time she has left. Both she and the Keatons rise to the challenge courageously, as she passes the f