Tristan Thompson calls Sydney Chase a 'liar', threatens lawsuit over cheating claims American basketball player and the father of Khloe Kardashian's daughter - Tristan Thompson has hired a legal team to handle the new cheating allegations from an Instagram model Sydney Chase, whom he calls a liar. Tristan Thompson calls Sydney Chase a 'liar', threatens lawsuit over cheating claims American basketball player and the father of Khloe Kardashian's daughter - Tristan Thompson has hired a legal team to handle the new cheating allegations from an Instagram model Sydney Chase, whom he calls a liar. Tristan Thompson took legal action against the podcast on which Sydney Chase claimed she slept with the Boston Celtics player.