Reign Aston Disick is your nephew because he is the son of your sister Kourtney Kardashian and Scott Disick your ex-brother-in-law and he is the brother of Mason and Penelope and Rocky and Landon and Alabama and Atiana and his aunts are you and Kim Kardashian and Khloé 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 True Thompson and Tatum Thompson and Dream Kardashian and Stormi Webster and Aire Webster