Isolde Beidler
Isolde Beidler (born Isolde von Bülow: 10 April 1865 – 7 February 1919) was the third of the five stepchildren and children of the composer Richard Wagner and his wife, who is generally known as Cosima Wagner (though the two of them married only in 1870).
Isolde herself married the Swiss-born conductor (1872-1930) and was the mother of author (1901-1981), celebrated at his birth as "Richard Wagner's first grandchild".
In view of the enduring interest in Richard Wagner's antisemitic opinions, it becomes intriguing that in 1923 Isolde Beidler posthumously acquired a Jewish daughter-in-law.
Henry Bryant (naturalist)
Henry Bryant( May 12, 1820 – February 2, 1867) was an American physician and naturalist.
He was the grandfather of Henry Bryant Bigelow.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Prithvipati Shah
Prithvipati Shah( ?–1716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal.
He was the grandfather of Nara Bhupal Shah.
Cosima Wagner
Cosima Wagner (born Francesca Gaetana Cosima Liszt; 24 December 1837 – 1 April 1930) was the illegitimate daughter of the Hungarian pianist and composer Franz Liszt and Marie d'Agoult.
She became the second wife of the German composer Richard Wagner, and with him founded the Bayreuth Festival as a showcase for his stage works; after his death she devoted the rest of her life to the promotion of his music and philosophy.
Commentators have recognised Cosima as the principal inspiration for Wagner's later works, particularly "Parsifal".
In 1857, after a childhood largely spent under the care of her grandmother and with governesses, Cosima married the conductor Hans von Bülow.
Although the marriage produced two children, it was largely a loveless union, and in 1863 Cosima began a relationship with Wagner, who was 24 years her senior.
She married him in 1870; after his death in 1883 she directed the Bayreuth Festival for more than 20 years, increasing its repertoire to form the Bayreuth canon of ten operas and establishing the festival as a major event in the world of musical theatre.
During her directorship, Cosima opposed theatrical innovations and adhered closely to Wagner's original productions of his works, an approach continued by her successors long after her retirement in 1907.
She shared Wagner's convictions of German cultural and racial superiority, and under her influence, Bayreuth became increasingly identified with antisemitism.
This was a defining aspect of Bayreuth for decades, into the Nazi era which closely followed her death in 1930.
Thus, although she is widely perceived as the saviour of the festival, her legacy remains controversial.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Fujiwara no Nagara
, also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period.
He was the grandfather of Emperor Yōzei.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).

Question: Who is Isolde Beidler's maternal grandfather?
Answer: Franz Liszt