CNN  —  World class sporting siblings may not be unheard of, but with the notable exception of Serena and Venus Williams in tennis , they are rarely in direct competition for the same big prize. Rarer still is a story with as many twists and turns as that of Marc and Álex Márquez, two brothers from the tiny town of Cervera in Spain’s northeastern region of Catalonia. Currently lying first and second in the MotoGP standings, they are vying for a world title at speeds of over 220 mph (354 kph) as