Gáborkó was the son of Miklós Pósa de Szer and NN Cibak. The date and place of his birth have not been found.
His wife was Margit Telegdi. They were married, but the date and place have not been found. Their nine known children were Katalin (?-?), János (?-<1452), György (?-?), Miklós (?-?), Péter (?-?), Erzsébet (?-?), Ágota (?-?), Margit (?-?) and Jusztina (?-?).