(CNN)Rugby runs in Billy Vunipola’s blood. His father Fe’ao captained Tonga in the 1990s when several uncles also represented the national side. His cousin Toby stars for Wales, while Vunipola and his brother Mako are standout players for England. But that hasn’t always made things easy, particularly during his early years. Born in Sydney, raised in Wales and then England when the family relocated to the UK — Fe’ao had signed to play for Pontypool — the imposing number eight Billy describes his itinerant upbringing as “frantic,” adding, “we were never settled anywhere until we came to England.” Britain proved something of a culture shock. “When we started setting up roots here, it was tough,” says Vunipola. “I remember our first few months in Wales we all just slept in the living room because we were used to being around each other. We just had duvets all over the floor.” Read More It’s an endearing image and one that’s difficult to picture today. Vunipola (right) celebrates England’s Six Nations victory over Scotland in 2016, when the team also won the grand slam. Visit cnn.com/sport for more news and videos Bulldozer Vunipola tips the scales at 130 kg. He’s a bulldozer…