When it came time for Sydney-based brother and sister BMX riders Kai and Saya Sakakibara to decide which country they would represent as athletes, the Olympic hopefuls were spoiled for choice.

Born in Australia's Gold Coast to a Japanese mother and British father, and having lived in Japan during their early childhood, the siblings could have chosen any of the three countries to further their athletic careers.

But 23-year-old Kai and 20-year-old Saya were especially torn over their bond between Japan and Australia.