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 Sophie of the Netherlands Princess Sophie of the Netherlands (Wilhelmine Marie Sophie Louise; 8 April 1824 – 23 March 1897) was the only daughter and last surviving child of King William II of the Netherlands and of his wife Grand Duchess Anna Pavlovna of Russia. She was heir presumptive to her niece, Queen Wilhelmina of the Netherlands, for seven years, from the death of her brother until her own death.