Ai Fukuhara has competed in the Olympics four times. She has been the main caregiver for his eldest son.
The son he had with former Taiwanese table tennis player Jiang Hongjie, from whom he divorced three years ago. He was brought back to Japan from Taiwan a year ago, and he was not handed over even after the visitation period had passed. The Tokyo Family Court ordered her to be extradited, but even after that, she did not comply, leading to a situation where her ex-girlfriend's husband filed criminal charges.