Kim Zolciak's ex Kroy Biermann is seeking sole custody of their minor children. According to court documents obtained by Us Weekly on Monday, March 30, Biermann, 40, asked a Georgia state judge to immediately change the pair's current joint custody arrangement. The former football player is seeking primary custody of his and Zolciak's children KJ, 14, Kash, 13, and twins Kaia and Kane, 11. (Zolciak is also the mother of daughters Brielle, 28, and Ariana, 24, from previous relationships, whom Biermann legally adopted during their marriage.