Péter was the son of Albert Lónyay de Nagylónya and Erzsébet Csapy. The date and place of his birth have not been found.
His wife was Magdalena Istvanaffy de Kisszoyfa. They were married, but the date and place have not been found. Their three known children were Ferencz (?-<1592), Krisztina (?-?) and Albert (?-?).
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