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.
Princess Caroline-Mathilde of Denmark Princess Caroline-Mathilde of Denmark (Danish: "Caroline-Mathilde Louise Dagmar Christine Maud Augusta Ingeborg Thyra Adelheid" ; 27 April 1912 – 12 December 1995) was a daughter of Prince Harald of Denmark and granddaughter of King Frederick VIII of Denmark. As the wife of Knud, Hereditary Prince of Denmark, she became Hereditary Princess of Denmark by marriage.