Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
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.
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.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
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.
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Herbert Beerbohm Tree
Sir Herbert Beerbohm Tree (17 December 1852 – 2 July 1917) was an English actor and theatre manager.
Tree began performing in the 1870s.
By 1887, he was managing the Haymarket Theatre, winning praise for adventurous programming and lavish productions, and starring in many of its productions.
In 1899, he helped fund the rebuilding, and became manager, of His Majesty's Theatre.
Again, he promoted a mix of Shakespeare and classic plays with new works and adaptations of popular novels, giving them spectacular productions in this large house, and often playing leading roles.
His wife, actress Helen Maud Holt, often played opposite him and assisted him with management of the theatres.
Although Tree was regarded as a versatile and skilled actor, particularly in character roles, by his later years, his technique was seen as mannered and old fashioned.
He founded the Royal Academy of Dramatic Art in 1904 and was knighted, for his contributions to theatre, in 1909.
His famous family includes his siblings, explorer Julius Beerbohm, author Constance Beerbohm and half-brother caricaturist Max Beerbohm.
His daughters were Viola, an actress, Felicity and Iris, a poet; and his illegitimate children included film director Carol Reed.
A grandson was the actor Oliver Reed.
Viola Tree
Viola Tree (17 July 1884 – 15 November 1938) was an English actress, singer, playwright and author.
Daughter of the actor Herbert Beerbohm Tree, she made many of her early appearances with his company at His Majesty's Theatre.
Later she appeared in opera, variety, straight theatre and film.

Question: Who is Viola Tree's paternal grandfather?
Answer: Julius Beerbohm