FREE Junior Ranger program for kids
I recommend Ford's Theatre for families with school age children. It's a great educational destination. Young children probably won't get much out of it, but they are welcome. You can move through the exhibits at your own pace. Ask about the FREE Junior Ranger program for kids ages 5-12 when you arrive. It's a great way to help kids get more out of the exhibits and they will receive a souvenir gold badge at the end.