János was the son of Elek Sarmasági de Sarmaság but his mother is unknown. The date and place of his birth have not been found.
His wife was Katalin Zólyomi de Albis. They were married, but the date and place have not been found. Their seven known children were István (?-<1548), Anna (?-1573), Gábor (?-<1591), Mihály (?-?), Gáspár (?-?), György (?-?) and Elek (?-?).
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