Infante Álvaro, Duke of Galliera
Álvaro de Orleans y Sajonia- Coburgo- Gotha, Duke of Galliera( 20 April 1910 – 22 August 1997), was a Spanish Infante, 6th Duke of Galliera and a second cousin of Infante Juan, heir to the Spanish throne from 1941.
Pedro Sainz Rodríguez
Pedro Sainz Carlos Rodríguez( 1897 in Madrid – 1986) was a Spanish writer, philologist, publisher and politician, an adviser to Infante Juan, Count of Barcelona and one of the main architects of the reign of Juan Carlos I of Spain and the Spanish transition to democracy.
Within the wide coalition of right- wing opinion that was the early movement behind Francisco Franco he was the leading figure of the monarchist wing.
In terms of character Sainz Rodríguez was noted for his quick wit, whilst physically he was known for his obesity.
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.
Infante Juan, Count of Barcelona
Infante Juan of Spain, Count of Barcelona ("Juan Carlos Teresa Silverio Alfonso de Borbón y Battenberg"; 20 June 1913 – 1 April 1993), also known as Don Juan, was the third son and designated heir of King Alfonso XIII of Spain and Victoria Eugenie of Battenberg.
His father was replaced by the Second Spanish Republic, and under his son, Juan Carlos I, a constitutional monarchy was restored.
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.
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.
Infanta Pilar, Duchess of Badajoz
Infanta Pilar of Spain, Duchess of Badajoz, Dowager Viscountess of la Torre( Spanish:" María del Pilar Alfonsa Juana Victoria Luisa Ignacia y Todos los Santos de Borbón y Borbón- Dos Sicilias"; born 30 July 1936), sometimes known more simply as Pilar de Borbón is the elder daughter of Infante Juan, Count of Barcelona and Princess María Mercedes of Bourbon- Two Sicilies, and older sister of King Juan Carlos I.
She has also a younger sister, Infanta Margarita of Spain.
Alfonso XIII of Spain
Alfonso XIII (17 May 1886 – 28 February 1941), also known as El Africano or the African, was King of Spain from 1886 until the proclamation of the Second Republic in 1931.
Alfonso was monarch from birth as his father, Alfonso XII, had died the previous year.
Alfonso's mother, Maria Christina of Austria, served as regent until he assumed full powers on his sixteenth birthday in 1902.
During Alfonso's reign Spain experienced four major problems that contributed to the end of the liberal monarchy: the lack of real political representation of broad social groups; the poor situation of the popular classes, especially peasants; problems arising from the Rif War; and Catalan nationalism.
The political and social turbulence that began with the Spanish–American War prevented the turnaround parties from establishing a true liberal democracy, which led to the establishment of the dictatorship of Miguel Primo de Rivera.
With the political failure of the dictatorship, Alfonso impelled a return to the democratic normality with the intention of regenerating the regime.
Nevertheless, it was abandoned by all political classes, as they felt betrayed by the king's support of the dictatorship of Primo de Rivera.
He left Spain voluntarily after the municipal elections of April 1931, which were taken as a plebiscite on abolishing the monarchy.
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.

Question: Who is Infante Juan, Count Of Barcelona's paternal grandmother?
Answer: Maria Christina of Austria