I just ran across a great post over on Cycle Pig about a family of four (Dad, Mom, and ten year old twin boys), and the family dog, that will be biking from Alaska to Argentina. When they have completed the trip, the boys will set the Guinness record for the youngest to bike the Pan-American Highway. They will begin their trip in June 2008. Here’s a link to Cycle Pig’s full article:

http://www.cyclepig.com/archive/family-on-bikes/