Ferenc was the son of György Petky de Ders and Dorottya Wass de Szent-Egyed. The date and place of his birth have not been found.
His wife is not known. They were married, but the date and place have not been found. Their four known children were Katalin (?-<1580), János (?-?), Magdolna (?-?) and Benedek (?-?).