Tillie earned a Bachelor of Science in Movement and Education in 1984, as well as a Diploma of Physiotherapy and Kinesiology in 1991, from the University of Nice. Tillie is a father of three: Kevin, Kim, and Killian, as well as the husband to the former Netherlands women’s national volleyball team captain, Caroline Keulen. Kim graduated from the University of Utah where he played for the Utah Utes men's basketball team. He went on to make the Men’s French National team, winning a bronze medal at the 2014 World Cup. Kevin attended the University of California, Irvine, where he became a 2-time NCAA Volleyball Champion with the UC Irvine Anteaters men's volleyball team, and is currently a member of the France men’s national team. The youngest, Killian, played for the Gonzaga Bulldogs men's basketball team at Gonzaga University.He is currently playing for the Memphis Grizzlies of the NBA. Killian was also in the France national team developmental system, winning a gold medal with France at the 2014 FIBA Europe Under-16 Championship and being named MVP of that competition.