Princess Margaret of Connaught
Princess Margaret of Connaught
(Margaret Victoria Charlotte Augusta Norah; 15 January 1882 – 1 May 1920) was Crown Princess of Sweden and Duchess of Scania as the first wife of the future King Gustaf VI Adolf.
She was the elder daughter of Prince Arthur, Duke of Connaught, third son of Queen Victoria of the United Kingdom, and his wife Princess Louise Margaret of Prussia.
Known in Sweden as Margareta, she died 30 years before her husband's accession to the throne of Sweden.
Princess Lilian, Duchess of Halland
Princess Lilian of Sweden, Duchess of Halland( born Lillian May Davies, later Craig; 30 August 1915 – 10 March 2013), was a British fashion model who became a member of the Swedish royal family through her 1976 marriage to Prince Bertil, Duke of Halland( 1912–1997).
As such, she was a paternal aunt of King Carl XVI Gustaf of Sweden and a maternal aunt of Queen Margrethe II of Denmark and Queen Anne- Marie of Greece.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Anne Denman
Anne Denman( 1587–1661) was born in Olde Hall, Retford, Nottinghamshire.
Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Prince Bertil, Duke of Halland
Prince Bertil, Duke of Halland
(Bertil Gustaf Oskar Carl Eugén; 28 February 1912 – 5 January 1997), was a member of the Swedish royal family.
He was the third son of King Gustaf VI Adolf and his first wife, Princess Margaret of Connaught, as well as the uncle of King Carl XVI Gustaf of Sweden, Queen Margrethe II of Denmark and Queen Anne-Marie of Greece.
From 1973 to 1979 he was heir presumptive to his nephew King Carl XVI Gustaf and the Swedish throne.
Louisa Montagu Douglas Scott, Duchess of Buccleuch
Louisa Jane Montagu Douglas Scott, Duchess of Buccleuch and Queensberry( 26 August 1836 – 16 March 1912) was the daughter of James Hamilton, 1st Duke of Abercorn.
In 1884, she became the Duchess of Buccleuch and Duchess of Queensberry, the wife of William Henry Walter Montagu Douglas Scott, 6th Duke of Buccleuch& 8th Duke of Queensberry.
She was the paternal grandmother of Princess Alice, Duchess of Gloucester and of Marian Louisa, Lady Elmhirst, as well as the maternal great- grandmother of Prince William of Gloucester, Prince Richard, Duke of Gloucester and great- great- grandmother of Sarah, Duchess of York.
Kaoru Hatoyama
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.
Knud Porse
Knud Pedersen Porse or Canute Porse( died 30 May 1330) was a medieval Danish nobleman and Duke of Samsø, Duke of Halland, and Duke of Estonia.

Question: Who is the maternal grandmother of Prince Bertil, Duke Of Halland?
Answer: Princess Louise Margaret of Prussia