Question:
Edward John Moreton Drax Plunkett, 18th Baron of Dunsany (; 24 July 1878 - 25 October 1957), was an Anglo-Irish writer and dramatist; his work, mostly in the fantasy genre, was published under the name Lord Dunsany. More than ninety books of his work were published in his lifetime, and both original work and compilations have continued to appear. Dunsany's oeuvre includes many hundreds of published short stories, as well as plays, novels and essays. He achieved great fame and success with his early short stories and plays, and during the 1910s was considered one of the greatest living writers of the English-speaking world; he is today best known for his 1924 fantasy novel The King of Elfland's Daughter Born and raised in London, to the second-oldest title (created 1439) in the Irish peerage, Dunsany lived much of his life at what may be Ireland's longest-inhabited house, Dunsany Castle near Tara, worked with W. B. Yeats and Lady Gregory, received an honorary doctorate from Trinity College, Dublin, was chess and pistol-shooting champion of Ireland, and travelled and hunted extensively.
Edward Plunkett (Dunsany), known en famille as "Eddie," was the first son of John William Plunkett, 17th Baron of Dunsany (1853-1899), and his wife, Ernle Elizabeth Louisa Maria Grosvenor Ernle-Erle-Drax, nee Ernle Elizabeth Louisa Maria Grosvenor Burton (1855-1916). From a historically wealthy and famous family, Lord Dunsany was related to many well-known Irish figures. He was a kinsman of the Catholic Saint Oliver Plunkett, the martyred Archbishop of Armagh, whose ring and crozier head are still held by the Dunsany family. He was also related to the prominent Anglo-Irish unionist, and later nationalist / Home Rule politician Sir Horace Plunkett, and George Count Plunkett, Papal Count and Republican politician, father of Joseph Plunkett, executed for his part in the 1916 Rising. His mother was a cousin of Sir Richard Burton, and he inherited from her considerable height, being 6' 4". The Countess of Fingall, wife of Dunsany's cousin, the Earl of Fingall, wrote a best-selling account of the life of the aristocracy in Ireland in the late 19th century and early 20th century, called Seventy Years Young. Plunkett's only grown sibling, a younger brother, from whom he was estranged from around 1916, for reasons not fully clear but connected to his mother's will, was the noted British naval officer Sir Reginald Drax. Another, younger, brother died in infancy. Edward Plunkett grew up at the family properties, most notably Dunstall Priory in Shoreham, Kent, and Dunsany Castle in County Meath, but also family homes such as in London. His schooling was at Cheam, Eton College and finally the Royal Military College, Sandhurst, which he entered in 1896.
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did he have any siblings?

Answer:
a younger brother,

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John Glascock (2 May 1951 - 17 November 1979) was the bass guitarist, backing vocalist, and occasional lead vocalist for the progressive rock band Carmen. He was also the bass guitarist and backing vocalist for the progressive rock band Jethro Tull from December 1975 until August 1979. He died in 1979, at the age of 28, as a result of a congenital heart valve defect, which was worsened by an infection caused by an abscessed tooth. In a September 1978 'Guitar Player' interview, Ritchie Blackmore had said "...
Glascock then joined Jethro Tull in 1976, after having met Ian Anderson when Carmen opened several dates for Jethro Tull on their War Child tour. Martin Barre said in the "Classic Artists Series" documentary, that his love for the band was unique, being a fan of Jethro Tull playing in the band. He played on the Jethro Tull albums Too Old to Rock 'n' Roll: Too Young to Die! (1976), Songs from the Wood (1977), Heavy Horses (1978), Bursting Out (1978), and on three tracks on Stormwatch (1979). In Jethro Tull he received no writing credits but sang backing vocals, and became the first harmony vocalist Jethro Tull had. He even sang on the album he was not credited on, Heavy Horses (1978). Glascock replaced the longtime friend of Ian Anderson, Jeffrey Hammond. He also played electric guitar on-stage when Anderson's arrangement required it, as for instance in performances of "Skating Away (On the Thin Ice of the New Day)" from the Bursting Out live album, when the rest of the band was playing xylophone, glockenspiel and percussion. Glascock's health problems became apparent when he was unable to complete the U.S. leg of the Heavy Horses tour, missing a transatlantic simulcast from Madison Square Garden. He played his last gig on 1 May 1979, in San Antonio, Texas, three years to the day of his first gig with Jethro Tull. Despite the diagnosis of heart valve damage caused by an infection, he continued his previous lifestyle, which involved heavy drinking, marijuana usage, and wild parties. His health continued to deteriorate. Ian Anderson gave him several warnings before finally laying him off with pay during the production of Stormwatch (1979), completing most of the bass guitar parts himself. During the subsequent promotional tour with replacement bass player Dave Pegg, Anderson learned of Glascock's death and had to break the news to the rest of the band. Glascock's close friend, drummer Barriemore Barlow, was devastated and left the band at the end of the tour. Mark Craney replaced Barlow. The resulting dislocation, Ian Anderson's own artistic vision, and a decision from the label, prompted a complete overhaul of the lineup, leaving only Anderson and Martin Barre as full members, though Glascock's touring replacement on bass (Dave Pegg) was retained for the band's follow-up album in 1980.

What kind of music did Jethro Tull make?
Jethro Tull albums Too Old to Rock 'n' Roll: Too Young to Die! (1976),