Miklós was the son of Frank Széchy de Rimaszécs but his mother is unknown. The date and place of his birth have not been found.
His wife was Dorottya Derencsényi. They were married, but the date and place have not been found. Their five known children were Péter (?-?), Tamás (?-?), László (?-<1508), Katalin (?-?) and Hedvig (?-?).
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