Given the question: Information: - Jacob Rauluni is currently the most prominent in a family of international halfbacks . His father , Taito , played halfback for Fiji , as does his brother Mosese . And his first cousin Waisale Serevi began his rugby career at halfback . Jacob had an extended spell playing rugby in the UK , and is best known for helping Rotherham Titans win promotion to the Premiership . In 2006 he played three tests for The Barbarians . He retired from international rugby in 2007 , having played 52 tests . He played his last test against Japan as captain of the national team . - Waisale Tikoisolomoni Serevi (born 20 May 1968) is a former Fijian rugby union footballer, and coach. Although he played fifteen-a-side rugby throughout his playing career, Serevi is most notable for his achievements in rugby sevens. He is widely considered as one of the greatest rugby sevens players ever. - Rugby sevens is a variant of rugby union in which teams are made up of seven players playing seven-minute halves, instead of the usual 15 players playing 40-minute halves. Rugby sevens is administered by World Rugby, the body responsible for Rugby Union worldwide. The game is popular at all levels, with amateur and club tournaments generally held in the summer months. Sevens is one of the most well distributed forms of rugby, and is popular in parts of Africa, Asia, Europe, and the Americas, and especially in the South Pacific. Rugby sevens is commonly referred to by rugby union media and fans as simply "sevens". What is the relationship between 'jacob rauluni' and 'rugby union'?
The answer is:
sport