Katalin was the daughter of Mihály Bethlen de Bethlen and Katalin Bornemisza de Petrelin. The date and place of her birth have not been found.
Katalin Bethlen de Bethlen
Mihály Bethlen de Bethlen (-1656)
György Bethlen de Bethlen
Katalin Thoroczkay de Toroczkószentgyörgy
Ilona Barlabási
Katalin Bornemisza de Petrelin