János was the son of András Lázár de Szárhegy but his mother is unknown. The date and place of his birth have not been found.
His wife was Klára Apafi de Apanagyfalu. They were married, but the date and place have not been found. Their seven known children were István (?-?), Ferenc (?-?), János (?-?), Imre (?-?), Orsolya (?-?), Mihály (?-?) and István (?-?).
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