Margit was the daughter of Mihály Jakcs de Kusaly but her mother is unknown. The date and place of her birth have not been found.
Her husband was István Bánffy de Losoncz. They were married, but the date and place have not been found. Their six known children were László (?-c1497), János (?-<1481), György (?-?), András (?-?), Mihály (?-<1498) and Katalin (?-<1479).