David is planning a vacation for his family. His mother and father want to accompany the family this year. Last year his parents did not travel with them. David has thought about visiting Miami, Florida again, and he really enjoyed the beach there last year. But this year they want to visit the mountains. They are looking at California, Colorado, and Idaho. David's wife, Emily wants the family to fly by plane for vacation this year and then rent a car. David wants to travel by car from their home in Atlanta. However, their sedan is not big enough to accommodate everyone who wants to go. David wants to rent a mini-van. His twin sons, Brandon and Brent have never been on an airplane before. They are three years old.