Brothers in arms: Victorious Brownlee boys embrace after winning gold AND silver as Alistair beats his younger sibling Jonny and makes history by becoming first triathlete to defend Olympic title

Alistair Brownlee (pictured right) has won Team GB's twentieth gold medal of the Olympics, edging out his younger brother Jonny in the triathlon. The 28-year-old has become the first triathlete to retain an Olympic title, while 26-year-old Jonny (left) beat his London 2012 effort of bronze to claim a silver medal. Alistair dominated the race in Hyde Park four years ago and fully justified his tag as favourite going into today's event on Copacabana Beach, which the two brothers once again dominated (shown inset