István was the son of János Sulyok de Lekcse but his mother is unknown. The date and place of his birth have not been found.
He had two marriages/partners. His first wife was Anna Almády. They were married, but the date and place have not been found. They had no known children.
His second wife was Borbála Bárczy. They were married, but the date and place have not been found. They had no known children.
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