When Grandpa absconds from the retirement home the Simpsons follow a trail to a former night-spot where they learn that Grandpa was once a talented song writer and pianist, who, after Mona's departure, married singer Rita La Fleur but eschewed a musical career with her to look after Homer. The family locate her for a reconciliation whilst Lisa becomes addicted to online poker and almost loses her college fund though Bart saves the day.
—don @ minifie-1