On Saturday, Andy Jameson wishes to visit his grandparents' home, his best friend's home, and also make a trip to the music store. He estimates the distances among these locations as follows: Andy's home to grandparents' home is 5.5 miles; Andy's home to best friend's home is 8 miles, Andy's home to music store is 2.5 miles; Andy's grandparents' home to best friend's home is 7 miles; Andy's grandparents' home to music store is 12 miles; best friend's home to music store is 4.5 miles. What is the minimum distance Andy can travel to visit his three destinations and return home?

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