Question: The Quest of Erebor was published by the third son of which novelist?

Context articles: The Quest of Erebor
Viscount Molesworth
Sir Henry Thompson, 3rd Baronet
Robert Smith, 1st Baron Carrington
Duke of Bedford
Hélie de Talleyrand-Périgord (cardinal)
Anson baronets
Viscount Hardinge
Christopher Tolkien
Abdul Wahab Siddiqi

"The Quest of Erebor" is a work of fantasy fiction by J. R. R. Tolkien, posthumously published by his son Christopher Tolkien in "Unfinished Tales" (1980).
 This work explains how and why Gandalf arranged for the retaking of the Lonely Mountain ("Erebor" in Sindarin), an adventure recounted from the perspective of Bilbo Baggins many years before in Tolkien's "The Hobbit".
Viscount Molesworth, of Swords in the County of Dublin, is a title in the Peerage of Ireland.
 It was created in 1716 for Robert Molesworth.
 He was made Baron Philipstown, of Swords in the County of Dublin, at the same time, also in the Peerage of Ireland.
 Molesworth had been invested as member of the Irish Privy Council in 1697, represented Camelford, Lostwithiel, East Retford and Mitchell in the British House of Commons and served as British Ambassador to Denmark.
 His elder son, the second Viscount, notably served as Ambassador to the Kingdom of Sardinia, the Grand Duchy of Tuscany and the Republic of Venice.
 He was succeeded by his younger brother, the third Viscount.
 He was a Field Marshal in the Army.
 On the death of his son, the fourth Viscount, this line of the family failed, and the titles passed to the latter's first cousin, the fifth Viscount.
 He was the eldest son of the Hon. William Molesworth, third son of the first Viscount.
 His son, the sixth Viscount, was a Major-General in the Army, who was lost in the wreck of "Arniston".
 On his death this line of the family also failed and the titles were inherited by his second cousin, the seventh Viscount.
 He was the eldest son of Richard, third son of the Hon. William Molesworth, third son of the first Viscount.
 He was succeeded by his nephew, the eighth Viscount.
 s of 2010 , the titles are held by the latter's great-grandson, the twelfth Viscount, who succeeded his father in 1997.
The Revd.
 Sir Henry Thompson, 3rd Baronet Thompson of Virkees (5 November 1796 – 1 July 1868) was the third son of Sir Charles Thompson, 1st Baronet, and Jane Selby.
 He succeeded to the baronetcy after his eldest brother the 2nd Baronet died without issue in 1826.
 On 26 February 1826 he married Hannah Jean Grey, third daughter of Sir George Grey, 1st Baronet, of Falloden, KCB, Commissioner at Portsmouth Dockyard, and Mary Whitbread, daughter of Samuel Whitbread.
 Sir George Grey was the third son of Charles Grey, 1st Earl Grey, and younger brother of Charles Grey, 2nd Earl Grey.
Robert Smith, 1st Baron Carrington {'1': ", '2': ", '3': ", '4': "} (22 January 1752 – 18 September 1838), was a British Member of Parliament and banker.
 He was the third son of Abel Smith (1717–1788) and his wife Mary ("née" Bird, 1724–1780).
 His grandfather, also named Abel Smith (c. 1690 – 1756), was the third son of Thomas Smith, the founder of Smith's Bank of Nottingham.
Duke of Bedford (named after Bedford, England) is a title that has been created six times (for five distinct people) in the Peerage of England.
 The first and second creations came in 1414 in favour of Henry IV's third son, John, who later served as regent of France.
 He was made Earl of Kendal at the same time and was made Earl of Richmond later the same year.
 The titles became extinct on his death in 1435.
 The third creation came in 1470 in favour of George Neville, nephew of Warwick the Kingmaker.
 He was deprived of the title by Act of Parliament in 1478.
 The fourth creation came 1478 in favour of George, the third son of Edward IV.
 He died the following year at the age of two.
 The fifth creation came in 1485 in favour of Jasper Tudor, half-brother of Henry VI and uncle of Henry VII.
 He had already been created Earl of Pembroke in 1452.
 However, as he was a Lancastrian, his title was forfeited between 1461 and 1485 during the predominance of the House of York.
 He regained the earldom in 1485 when his nephew Henry VII came to the throne and was elevated to the dukedom the same year.
 He had no legitimate children and the titles became extinct on his death in 1495.
Hélie de Talleyrand-Périgord (1301–17 January, 1364) was a French Cardinal, from one of the most aristocratic families in Périgord, south-west France.
 Hélie was born at Périgueux, third son of Elias VII, Count of Périgord, and Brunissende de Foix, daughter of Roger Bernard III, comte de Foix.
 His elder brothers were Archambaud (IV), who inherited the County, and Roger-Bernard (who married Eleanor, daughter of Bouchard, Comte de Vendôme); his younger brother was Fortanier, and his sisters were Agnes (who married John of Sicily Duke of Durazzo and de Gravina in 1321), Jeanne (who married Ponce, Seigneur de Castillon), Marguerite (who married Éméric de Lautrec), and Rosemburge (who married Jacques de Lavie, grand-nephew of Pope John XXII).
 As a third son Hélie was destined for an ecclesiastical career.
 His brother, Roger Bernard, too, had an ecclesiastical career, becoming Canon of Lyon.
 But then, the eldest son died, and Roger-Bernard became the Count of Périgord.
 Hélie became a major figure in the Avignon papacy, and also a diplomat engaged in the negotiations of the Hundred Years' War, having friendships in both English and French royal families.
 In his last months he had been appointed Papal Legate for a crusade against the Turks.
The Anson Baronetcy, of Birch Hall in the County of Lancaster, is a title in the Baronetage of the United Kingdom held by a branch of the Anson family.
 It was created on 30 September 1831 for William Anson.
 He was the third son of George Anson; his elder brothers were Thomas Anson, 1st Viscount Anson and General Sir George Anson.
 Sir William was the uncle of Thomas Anson, 1st Earl of Lichfield and Major-General George Anson and the great-nephew of George Anson, 1st Baron Anson (see Earl of Lichfield, 1831 creation for more information on the Anson family).
 His grandson, the third Baronet, was a lawyer and Liberal Unionist politician.
 He never married and was succeeded by his nephew, the fourth Baronet.
 He was the only son of Frederick Arthur Anson, third son of the second Baronet.
 The fourth baronet drowned in the Thames in July 1914, aged only twenty-five.
 He had not married and on his death the title passed to his first cousin, the fifth Baronet, the eldest son of Rear-Admiral Algernon Horatio Anson (1854–1913), fourth and youngest son of the second Baronet.
 He was killed in action in the First World War.
 He was unmarried and was succeeded by his younger brother, the sixth Baronet.
 As of 2007 the title is held by the latter's son, the seventh Baronet, who succeeded in 1951.
 He is a retired Rear-Admiral in the Royal Navy.
Viscount Hardinge, of Lahore and of Kings Newton in the County of Derby, is a title in the Peerage of the United Kingdom.
 It was created in 1846 for the soldier and Tory politician Sir Henry Hardinge.
 His son, the second Viscount, represented Downpatrick in Parliament.
 His great-great-grandson, the sixth Viscount, succeeded a distant relative as eighth Baronet, of Belle Isle in the County of Fermanagh, in 1986.
 This title had been created in the Baronetage of the United Kingdom 1801 for Richard Hardinge.
 He was the third son of Nicolas Hardinge, younger brother of Reverend Henry Hardinge and uncle of the latter's third son Henry Hardinge, 1st Viscount Hardinge.
 The baronetcy was created with special remainder to the heirs male of Richard Hardinge's father.
Christopher John Reuel Tolkien (born 21 November 1924) is the third son of the author J. R. R. Tolkien (1892–1973), and the editor of much of his father's posthumously published work.
 He drew the original maps for his father's "The Lord of the Rings", which he signed C. J. R. T.
He was born in 1942, the third son of Muhammad Umar Icharvi, one of Pakistan's leading Sufi scholars of the time, who held the honorary title of "Munazare-Azam" (the greatest debater) because of his success in defeating the leaders of rival Islamic sects.
 Despite being the third son, Abdul Wahab was made the head of the branch of the Naqshbandi Sufi order by his father.
 He founded or co-founded a number of important Islamic Institutions in the United Kingdom and established the Hijazi Sufi Order.