Tatum Thompson is your nephew he is the son of your sister Khloé Kardashian and Tristan Thompson ex-your brother-in-law and he is the brother of True Thompson and his aunts are you and Kim Kardashian and Kourtney Kardashian and Kendall Jenner and Kylie Jenner and his only uncle is Rob Kardashian and the grandson of Kris Jenner and his cousins are North West and Saint West and Chicago West and Psalm West and Mason Disick and Penelope Disick and Reign Disick and Rocky Barker and Dream Kardashian and Stormi Webster and Aire Webster