János was the son of Ferenc Tholdalagi de Nagy-Iklód and Klára Frátai. The date and place of his birth have not been found.
His wife was Borbála Gyerõffy de Gyerõvásárhely. They were married, but the date and place have not been found. Their five known children were Ferenc (?-?), Gábor (?-?), Klára (?-?), Krisztina (?-?) and Zsuzsanna (?-?).
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