Miklós was the son of Péter Apafi de Apanagyfalu but his mother is unknown. The date and place of his birth have not been found.
His wife was Anna Váradjai. They were married, but the date and place have not been found. Their five known children were László (?-<1440), Ilona (?-?), Anna (?-?), Borbála (?-?) and Margit (?-?).