One is a household name for his skills on the rugby field and marketability, and his sister is on her way to emulating him; the Williams siblings, Sonny Bill and Niall, are set for a rare double tomorrow when the New Zealand Olympic sevens teams are announced.
The announcement of the mens' and women's squads will be announced at Eden Park at 1pm and all eyes will be on whether the pair make it.
Sonny Bill, who has represented the All Blacks at two World Cups, is considered a good chance to make the men's squad to Rio by All Blacks coach Steve Hansen, who said recently that he plans to get him straight back into the 15-man code once the 30-year-old's Olympics duties are over.
Hoping to join him at the historic Games, where rugby will be played for the first time since 1924, is little sister Niall, 28, a New Zealand touch player for 10 years before making the switch to the full tackle game last year. She is a mother of two small children.
In a Herald on Sunday interview in May, Niall was asked about what it would mean to the Williams family should the pair both represent their country in Rio. "Even with me playing touch and all of Sonny's achievements, they're already proud," she said. "But the Olympics are the pinnacle of sport so, if we both made it, the family would be ... I guess words can't describe the feelings they would have, but proud comes to mind straight away.