István was the son of Ehellős Thoroczkay de Toroczkószentgyörgy but his mother is unknown. 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 Ehellős (?-?), Mihály (?-?), Elek (?-?) and László (?-?).
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