Katalin was the daughter of Gáborkó Pósa de Szer and Margit Telegdi. The date and place of her birth have not been found.
Her husband was Pető Gersei. They were married, but the date and place have not been found. Their four known children were János (?-1521), György (?-?), Katalin (?-?) and Dorottya (?-?).
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