When you are in the car, play an alphabet game. With younger children, takes turns as you think of any object you SEE that starts with each letter: For A, say, I see an auto. For B, say, I see a boy. Help young children with this game until they are old enough to find answers for themselves.
Older children and adults can play using any theme: characters from books, geographic names, favorite adjectives, etc. If you are currently reading a TogetheREAD book as a family, use people, places, and events from the book as your theme. Make the game even more challenging by requiring each player to repeat all preceding letters and words before adding one more.