Question: Who is the paternal grandmother of Walburga Habsburg Douglas?

Knowledge 1: Walburga Habsburg Douglas
Countess Walburga Habsburg Douglas (born 5 October 1958) is a German-born Swedish lawyer and politician, who served as a member of the Riksdag of Sweden for the Moderate Party from 2006 to 2014.She is the vice-president of the Paneuropean Union and a board member of the Institute for Information on the Crimes of Communism.She is a daughter of Otto von Habsburg, the last crown prince of Austria-Hungary, and a granddaughter of Emperor Charles I of Austria.Her ancestral titles are Archduchess Walburga of Austria, Archduchess and Princess Imperial of Austria, Princess Royal of Hungary and Bohemia, with the style of "Her Imperial and Royal Highness." Although her family used those titles during her childhood, she does not actively use them in her daily life, although she has stated that she still holds the titles.In Sweden she legally holds the title Countess Douglas of Skenninge, as the wife of Count Archibald Douglas, a member the Swedish branch of the Scottish noble house, the Clan Douglas and a descendant of Field Marshal Robert Douglas, Count of Skenninge.She lives at Ekensholm Castle in Sweden. [SEP] Knowledge 2: Otto von Habsburg
Otto von Habsburg (20 November 1912 4 July 2011), also known by his traditional royal title of Archduke Otto of Austria, was the last Crown Prince of Austria-Hungary from 1916 until the dissolution of the empire in 1919, a realm which comprised modern-day Austria, Hungary, Bosnia and Herzegovina, Croatia, the Czech Republic, Slovakia, Slovenia, and parts of Italy, Montenegro, Poland, Romania, Serbia and Ukraine.He became the pretender to the former thrones, Head of the House of Habsburg-Lorraine, and Sovereign of the Order of the Golden Fleece in 1922, upon the death of his father.He resigned as Sovereign of the Golden Fleece in 2000 and as head of the Imperial House in 2007.The eldest son of Charles I and IV, the last Emperor of Austria and King of Hungary, and his wife, Zita of Bourbon-Parma, Otto was born as third in line to the thrones, as Archduke Otto of Austria, Royal Prince of Hungary, Bohemia, and Croatia.With his father's accession to the thrones in 1916, he was likely to become emperor and king.As his father never abdicated, Otto was considered by himself, his family and Austro-Hungarian legitimists to be the rightful emperor-king from 1922.Otto was active on the Austrian and European political stage from the 1930s, both by promoting the cause of Habsburg restoration and as an early proponent of European integration—being thoroughly disgusted with nationalism—and a fierce opponent of Nazism and communism.He has been described as one of the leaders of the Austrian Resistance.After the 1938 "Anschluss", where monarchists were severely persecuted in Austria and sentenced to death by the Nazis, Otto fled Europe to the United States.Otto von Habsburg was Vice President (1957–1973) and President (1973–2004) of the International Paneuropean Union, and served as a Member of the European Parliament for the Christian Social Union of Bavaria (CSU) from 1979 to 1999.As a newly elected Member of the European Parliament in 1979, Otto had an empty chair set up for the countries on the other side of the Iron Curtain in the European Parliament, and took a strong interest in the countries behind the Iron Curtain.Otto von Habsburg played a notable role in the revolutions of 1989, as a co-initiator of the Pan-European Picnic.Later he was a strong supporter of the EU membership of central and eastern European countries.A noted intellectual, he published several books on historical and political affairs.Otto has been described as one of the "architects of the European idea and of European integration" together with Robert Schuman, Konrad Adenauer, and Alcide De Gasperi.Otto was exiled in 1919 and grew up mostly in Spain.His devout Catholic mother raised him according to the old curriculum of Austria-Hungary, preparing him to become a Catholic monarch.During his life in exile, he lived in Switzerland, Madeira, Spain, Belgium, France, the United States, and from 1954 until his death, finally in Bavaria (Germany), in the residence "Villa Austria".At the time of his death, he was a citizen of Germany, Austria, Hungary, and Croatia ,having earlier been stateless "de jure" and "de facto", and possessed passports of Monaco, the Order of Malta, and Spain.His funeral took place at St. Stephen's Cathedral in Vienna on 16 July 2011; he was entombed in the Imperial Crypt in Vienna and his heart buried in Pannonhalma Archabbey in Hungary.
Knowledge 1: 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. [SEP] Knowledge 2: Diana Guardato
Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan CarlosI of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others.
Knowledge 1: Walburga Habsburg Douglas
Countess Walburga Habsburg Douglas (born 5 October 1958) is a German-born Swedish lawyer and politician, who served as a member of the Riksdag of Sweden for the Moderate Party from 2006 to 2014.She is the vice-president of the Paneuropean Union and a board member of the Institute for Information on the Crimes of Communism.She is a daughter of Otto von Habsburg, the last crown prince of Austria-Hungary, and a granddaughter of Emperor Charles I of Austria.Her ancestral titles are Archduchess Walburga of Austria, Archduchess and Princess Imperial of Austria, Princess Royal of Hungary and Bohemia, with the style of "Her Imperial and Royal Highness." Although her family used those titles during her childhood, she does not actively use them in her daily life, although she has stated that she still holds the titles.In Sweden she legally holds the title Countess Douglas of Skenninge, as the wife of Count Archibald Douglas, a member the Swedish branch of the Scottish noble house, the Clan Douglas and a descendant of Field Marshal Robert Douglas, Count of Skenninge.She lives at Ekensholm Castle in Sweden. [SEP] Knowledge 2: Diana Guardato
Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan CarlosI of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others.

Answer: Zita of Bourbon-Parma