Robert NIXON of London 
- Marriage (1): Lucretia WILSON  in 1754
- Died: 15 Dec 1794
It was recorded in the diaries of Joseph Farington, artist/painter, and accepted by National Portrait Gallery and Royal Academy etc, that James Nixon born 1741 , was the brother of John and Richard Nixon, all born between 1755 and 1761The mother of the latter three was Lucretia Nixon (nee Wilson) who was married to Robert Nixon on 27 July 1754. We therefore have to assume that Robert Nixon was married previously to another woman, and that they had three children, James NIXON, and two daughters, names unknown. Perhaps these first three children were illegitimate?
Hence, James Nixon and John, Robert, Richard and George Nixon were half brothers.
I Robert Nixon of Dulwich in Surrey will and bequeath to my eldest son John Colley Nixon the sum that he has already had from me in business out of which he is to allow annually to his third Brother the Revd Robert Nixon the sum of fifty pounds or as much as his generosity and welfare in trade can allow the money I may possess in possess in trade and money both real and personal I divided equally between my sons George Francis Nixon and Richard Nixon I hereby confirm the bond of my wife Lucretia Nixon, December the 15th 1794 in the presence of Charles Francis.
In the Prerogative Court of Canterbury
In the case of Robert Nixon deceased
20th Day of day of December 1794
Appeared personally John Colley Nixon of Cateaton Street of London factor and Richard Nixon of Devonshire Square London Merchant two of the natural and lawful sons of Robert Nixon late of Dulwich in the Parish of St Giles Camberwell in the county of Surrey deceased and Charles Francis of Dulwich aforesaid doctor and apothecary and made oath as follows and first the deponent John Colley Nixon said that on the fifteenth day of the present month of December the said deceased being sensible of the illness of whereof he died on the same day and then lying in his bed and in his room a short conversation took place between the said deceased and the deponent John Colley Nixon in respect to any will which the said deceased had made and he the said deceased then declared that he had not made any will and expressed a desire to make a disposition of his property and gave this deponent directions and instruction by word of mouth for the working of his will but being asked if he could sign a will the said deceased said that he could not write and the deponents John Colley Nixon and Richard Nixon made oath that pursuant to such directions and instructions of the said deceased the deponent Richard Nixon under the instructions of the deponent John Colley Nixon drew or wrote the paper wiring hereunto annexed purporting to be the last will and testament or testamentary schedule of the said deceased beginning thus "I Robert Nixon of Dulwich in Surrey" ending thus "I hereby confirm the bond of my wife Lucretia Nixon and dated December the 15th 1794 and after the same was written it was read all over to the said deceased and in an audible and distinct manner by the deponent John Colley Nixon the deponent Richard Nixon being also present and the deceased then expressed his approbation thereof and say'd he wanted the deponent Charles Francis who shortly afterwards came to the house of the said deceased on being informed by the other deponents of such the wish and desire of the said deceased took the said will or testamentary schedule to read to the said deceased and as the said deceased was then extremely ill and much reduced in bodily strength the deponent Charles Francis desired that the said deceased would if he approved of his said will or testamentary schedule either by holding up his hand or nodding his head signify his approbation thereof that the deponent Charles Francis then read the said will or testamentary schedule to the said deceased audibly and deliberately paragraph by paragraph and the said deceased at the end of each paragraph held up his hand and nodded his head as tokens of his approbation of his said will and testamentary schedule and the deponent Charles Francis then subscribed his name thereto as a witness in manner as now approves thereon and these deponents further made oath that the said will or testamentary schedule was so as aforesaid twice read to the said deceased about seven o'clock in the evening of the said fifteenth day of the present month that the said deceased was then very much reduced by his sickness and extremely debilitated and weak but was at and during all and singular the transactions before deposed to of sound and disposing mind memory and understanding and very well knew and understood what he said and did and what was said and read to him and they the deponents say that they are each of them convinced in their own minds that the said deceased fully approved of the said will or testamentary schedule and would have signed and regularly executed the same if he had bodily strength to enable him so to do and they lastly made oath that the said deceased departed this life between the hours of eight and nine of the evening of the aforesaid fifteenth day of the present month of December without executing or signing his said will or testamentary schedule leaving behind him Lucretia Nixon his lawful widow and relict and also and these deponents John Colley Nixon and Richard Nixon and also George James Nixon and the Revd Robert Nixon clerk his natural and lawful children and only next of kin and the only persons who would have been entitled in distribution to his personal whose personal estate in case he had died intestate - J H Nixon - Richard Nixon - Charles Francis 20 December 1794 - the said John Colley Nixon Richard Nixon and Charles Francis were duly sworn to the trust of this affidavit before Th. Ch. Crespigny surrogate pst James Bush NP [notary public].
On the twenty fourth day of December in the year of our Lord one thousand seven hundred and ninety four administration (with the will or testamentary schedule annexed ) of all and singular the goods chattels and credits of Robert Nixon late of Dulwich in the Parish of St Giles Camberwell in the country of Surrey deceased was granted to James [John Colley?] Nixon and Richard Nixon the sons of the deceased and residuary legatees named in the said will and testamentary schedule they having been first sworn duly to administer no executor being named in the said will.
For many years institutions, historians and genealogists have believed, based on Farington's Diary, that James Nixon  the miniaturist, was the half brother of John Colley Nixon and Rev Robert Nixon, two sons of Robert & Lucretia Nixon.
A close study of the Diary and the families by Stephen Massil reveals James had a sister Susanna Nixon who married Sir James-Nassau Colleton 3 Dec 1778 whose father was William Nixon of Leicester.
He finds no evidence in the Diary of James being the son of Robert Nixon, and concludes his father was William.
Furthermore one of James Nixon's portraits of 1793 is of a 'Miss Colleton', who Massil suggests was Susanna Boone Colleton (1787-1816) James Nixon's niece.
Ref: https://books.google.co.nz/books?id=DUcRAQAAIAAJ&pg=PA101&lpg=PA101&dq=Sir+James-Nassau+Colleton&source=bl&ots=mWacZEBVNZ&sig=MBNnn7V7dXXnADou2Ry8u_von00&hl=en&sa=X&ei=hAivVKyaG8Ln8AXSsYGwAg&ved=0CDcQ6AEwCA#v=onepage&q=Sir%20James-Nassau%20Colleton&f=false <https://books.google.co.nz/books?id=DUcRAQAAIAAJ&pg=PA101&lpg=PA101&dq=Sir+James-Nassau+Colleton&source=bl&ots=mWacZEBVNZ&sig=MBNnn7V7dXXnADou2Ry8u_von00&hl=en&sa=X&ei=hAivVKyaG8Ln8AXSsYGwAg&ved=0CDcQ6AEwCA>
Should you wish to discuss this proposition further, or have an interest in the Nixon families please contact Stephen Massil on firstname.lastname@example.org
Robert married Lucretia WILSON  [MRIN: 3366] in 1754.