"It isn't safe for Grandma to drive a car.", Mom says. I make a goofy face and laugh.

Everyone knows Grandma is a really careful driver. She makes complete stops at every stop sign and will never go one little bit faster than the speed limit. Grandma even turns on her headlights the very, exact minute it starts getting dark outside.

Mom isn't laughing. "This isn't a joke, Claire. Driving isn't the only problem.. Your grandmother also shouldn't live alone anymore. Grandma has Alzheimer's Disease."