Who is Mary, Crown Princess of Denmark's mother-in-law?
Frederik, Crown Prince of Denmark Frederik, Crown Prince of Denmark, Count of Monpezat, {'1': ", '2': ", '3': 'RE, SKmd', '4': "} (Frederik André Henrik Christian; born 26 May 1968) is the heir apparent to the throne of Denmark. Frederik is the elder son of Queen Margrethe II and Henrik, the Prince Consort.
Louise of Mecklenburg-Güstrow Louise of Mecklenburg-Güstrow (28 August 1667 – 15 March 1721) was Queen consort of Denmark and Norway as the first spouse of the King Frederick IV of Denmark.