And Every Morning the Way Home Gets Longer and Longer by Fredrik Backman

In this novella by best-selling author Backman, a grandfather and his grandson, Noah, spend time together as the grandfather falls deeper into dementia. Both share a passion for math, which bonds them together. Noah's dad, Ted, however, is more interested in the arts, so Ted and his father aren't as close. And Every Morning the Way Home Gets Longer and Longer is a poignant story of love, memories, and loss.