Mary Balchen's sister Elizabeth (below) married George Cumberland on 21 September 1749 at St Olave's Hart Lane and they had two sons, George (photographed right) and Richard. Eliza Balchen married George Cumberland Snr in 1749. The Cumberland brothers and their aunt Mary Man had a stormy relationship which is described in a series of letters between the two brothers, some of which have been published as  'The Cumberland Letters' an have been extracted here.  A major piece of correspondence is missing from 'The Cumberland Letters' and that is the disagreement between George, son of George Snr., and David Ricardo over what happened to Ricardo's servant girl when she met George's youngest son Sydney. The letters can be read here.

The Cumberland bothers were quite close to their Man cousins. For example James Man's Will contains the following: '[I] ... bequeath twenty pounds to each of my particular friends the Reverend Richard Dennison Cumberland of Cirencester, George Cumberland of Bristol.' Both brothers subscribed to the publication of Henry Man's 'Miscellaneous Works' (1802). George Cumberland is today remembered, in part, for his close and life long friendship with the poet and artist William Blake. George's entry on the Dictionary of National Biography can be read here. The following is extracted from the Grove Dictionary of Art.

"Cumberland, George (London, 1754; Bristol, 1848). English writer, collector and amateur artist. He became a clerk on the death of his father in 1771, until freed from financial necessity by a legacy in 1785. In 1788 he left for Rome, where he studied the London, 1754; Bristol, 1848). English writer, collector and amateur artist. He became a clerk on the death of his father in 1771, until freed from financial necessity by a legacy in 1785. In 1788 he left for Rome, where he studied the work of Raphael, Marcantonio Raimondi and Giulio Bonasone, and collected prints and curios. Cumberland returned to England in 1790 and lived near Southampton, adding to his collections and corresponding with Thomas Johnes (1748 - 1816) of Hafod in Cardiganshire (now Dyfed), who praised his Poem on the Landscapes of Great Britain, written in 1780 but not published until 1793. By this time he was living near Windsor and proximity to London allowed him greater intimacy with William Blake, whom he had met through Thomas Stothard before 1788. In 1793 he published Some Anecdotes of the Life of Julio Bonasoni, prefaced by A Plan for the Improvement of the Arts in England, which urged the establishment of a national gallery. An Attempt to Describe Hafod (1796), Johnes’s estate, contains a folding map engraved by Blake, who also provided eight of the 24 plates illustrating ‘Thoughts on Outline’(1796), a subject to which he returned in Outlines of the Ancients’(1829), which contains three further Blake engravings. In 1808 Cumberland settled in Bristol, where he became an influential figure in artistic circles. His landscape sketches and watercolours produced at this time have a simple directness of vision, reminiscent of those of his friend John Linnell (e.g. Bristol, Mus. & A.G.). He catalogued his collection of prints, which he presented to the Royal Academy and the British Museum, in the Utility of Collecting the Best Works of the Ancient Engravers of the Italian School (1827)."
 

Notes for RICHARD DENISON CUMBERLAND: The Gentleman's Magazine and Historical Chronicle From January to June 1825. Vol XCV. p. 378, April. 

Rev. R.D. Cumberland, LL.B.  Jan. 31. At Driffeld, near Cirencester, after long and severe sufferings from the stone, aged 72, the Rev. Richard Denison Cumberland. He was of Magdalen College, Cambridge; was presented to the Vicarage of Driffeld, with the annexed Chapelry of Harnhill, by T. Smith, esq. in 1776, and took his degree of LL.B. in 1780. During his long ministry he scarcely ever quitted the care of his churches, contributing always willingly to the comforts of the labouring poor, and fulfilling the necessary duties of a good Magistrate and Rural Dean. Liberal to others on all occasions, and temperate in the use of the goods of fortune himself, he died without having created an enemy by his own fault.  

His descent was from Denison Cumberland, Archdeacon of Northampton, whose son was the celebrated Richard Cumberland, Bishop of Peterborough, the author of Sanchoniathe's Phoenician History, the Law of Nature, and a Treatise on Hebrew Weights and Measures, &c. He was also grandson to John Cumberland, whose noble invention of Bending ship timber by means of steam in cases of sand, has been the means of saving millions to this country, and in which he expended a large fortune, without receiving any adequate reward. His descent on the maternal side was equally honourable, being in a direct line from the renowned Admiral Balchen, who was lost in the ship Victory, and to whose memory Government erected a monument in Westminster Abbey. He was left a widow, and one only daughter, married to the Rev. J.P. Jones, A.M. of Brecon.

 Notes for SUSANNA TIMBRELL (RDC's wife):

Leonard Stanley Manor estate was sold between 1736 and 1738 when it was divided among more than twenty purchasers but the manor and a large part of the land were bought in 1738 by Robert Sandford of the Priory. Robert Sandford died in 1769, and was succeeded by his son, also Robert (d. 1804), who devised the manor to Robert Timbrell (d. 1811). It passed to Robert Timbrell's sisters, Rebecca Holland (d. 1815) and Amy Timbrell (d. 1818). Land-tax for the estate was paid until his death c. 1825 by the Revd. Richard Denison Cumberland, the husband of a third sister Susannah, and until 1832 by his widow, but in 1830 the estate was said to be held by trustees under the will of Amy Timbrell and Rebecca Holland, who were the owners at inclosure in 1834.  In 1856 it was owned by the Revd. John Price Jones who had married Susannah Willet Cumberland, the daughter of Richard and Susannah. Jones was dead by 1863 and his widow held the estate until her death c. 1875. The manor passed to her son Richard Denison Jones (d. 1903), whose son Richard Denison Cumberland Jones (d. 1916) was succeeded by his sisters Katherine Anna (d. 1940) and Lucy Elizabeth who c. 1959 sold Priory Farm with 310 a. to F. E. Pullin, the farmer since 1932.  From: 'Leonard Stanley: Manor and other estates', A History of the County of Gloucester: Volume 10: Westbury and Whitstone Hundreds (1972), pp. 259-61.