Corinne Sullivan / Cosmopolitan: Ben Simmons' Sister Dragged Kendall Jenner on TikTok, and Now Fans Are All Asking the Same Question - Side note: Who else had no idea Ben Simmons is Australian? - Sister of NBA player Ben Simmons, Olivia Simmons, posted a TikTok roasting Kendall Jenner for a time she made "terrible" cookies while dating Ben.