Most siblings to complete a marathon on each continent

The most siblings to complete a marathon on each continent is 2 and was achieved by Mustapha and Mazen Mroueih (both Lebanon), from 8 to 19 February 2015.

Mroueih brothers finished the following races:

Australia: Carlton Classic Marathon, Asia: Abu Dhabi Striders Marathon, Europe: Torcy International Marathon, Africa: The Carthage Race, North America: Lincoln’s Birthday International Marathon, South America: Southern Cross Marathon, Antarctica: Penguin Marathon.