Sonny Bill Williams' sister Niall makes a stunning flick pass for a try

If you're a fan of Sonny Bill Williams, you already know about the amazing skill set he possesses. It seems the Williams family has plenty of athletic genes to go around, though, as his sister is now making a name for himself on the Women's 7s curcuit.  Very few can represent even one sport at the highest level, but fewer still are those that can play – and play well – across multiple professional codes. If nothing else, even SBW's haters have to admit he is a supremely-gifted athlete. Enter Niall Williams – Sonny Bill's sister. Niall made her debut with the New Zealand women's 7s te…