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Allegonda Boom / Hall had three siblings, Dorothy Willemina Boom / Manning, Christian Boom and an unnamed child who died in infancy. The Family Register records only their births, deaths, and the marriage of Dorothy Willemina Boom to Bryan Manning. However, Dorothy Willemina had at least two children and Christian Boom junior at least nine children.
Dorothy Willemina Boom married Brian Manning on the 20 Sep 1760. Their children were baptised in Kingston, Jamaica:
Dorothy Manning b. 1769, bap. 13 Jan 1770
Dorothy Manning b. 23 May 1772, bap. 20 Jun 1772
The fact the both had the same christian name tells me immediately that the first died before the second was born. It was very common then to call a new baby by the name of a dead elder child. The Manning name was very rare at that time in Jamaica, and thus easy to track, but I didn't find any record of Brian Manning being born in Jamaica. The only other information about that family that I have found is Brian Manning's death. He was buried on the 28 Jun 1777 (a year and a half after Allegonda) in Kingston, Jamaica. His occupation at death is listed as Merchant. Dorothy herself lived on another eighteen years dying 25 Oct 1795 and buried in Kingston 26 Oct 1795.
Brian Manning may have had relatives in Jamaica. For instance, there was an Ashly Manning who married Mary Townsend in St Andrew in 1748. William Manning, Tavern Keeper, was buried in Kingston 25 Jul 1754. The Honourable Edward Manning Esquire was buried in Kingston 6 Dec 1756. No connection has so far been found between Brian and these.
The story of Christian Boom the younger is interesting and acts as a social commentary. I haven't researched it fully so there are still some puzzling gaps. Christian never married but did have what we now call a defacto. Further, I had earlier been familiar with two ways a person could change their name, by marriage and by deed poll. In this instance his defacto changed her name a third way, by baptism.
Christian Boom's defacto was Sarah Pynes / Boom. The last name is spelled PYNES, POYNTZ, PINES & PINOS in the Kingston Parish Register. The first two spellings are the most likely, one of the Church wardens had last name PYNES. In addition, one of the family names from "Burke's Landed Gentry" is POYNTZ and that family spent some time in Jamaica. The fact that her last name is spelled so many ways suggests that Christian, unlike his sister Allegonda, may have been illiterate. That is consistent with his occupation, which is listed at his burial in Kingston on 4 Feb 1803 as "Sexton of this parish". A sexton is a church groundskeeper and occasional gravedigger.
Now Sarah Pynes / Boom was a free mulatto. This is a statement of race. One web site has the following: "The distinctions within the coloured caste in the early eighteenth century were: white with black produces mulatto; mulatto with white produces quadroon; quadroon with white produces mestee; mestee with white is legally white and free by law; mulatto with black produces sambo." Later, the distinctions became blurred and mixed race people were just referred to as coloured or brown. However, in every one of the ten Parish Register entries in which Sarah Pynes / Boom appears, she is referred to as a free mulatto.
The PYNES or POYNTZ name may or may not indicate that her father had that surname. Slaves were usually given the same surnames (and often first names) as their first owners, which makes tracing families difficult at times. However, as Sarah was the product of a mixed race liaison and the children of such liaisons more often than not inherited their white father's name, Sarah may be a direct descendant of the aristocratic Poyntz family.
At that time, mixed race liaisons were very common (we'll see a few more further down the track) but mixed race marriages were rare to the point of non-existence (except that sometimes, but not always, a quadroon will marry a mulatto). Perhaps I should also add that liaisons between white males and coloured females were far more common than the other way around. This is not to say that these liaisons were casual, so far as I can ascertain, Christian Boom the younger had every single one of his children with the same woman. Also, keep in mind that Christian himself is probably of mixed dutch - english ancestry.
Now Sarah arranged what I call 'marriage by baptism'. She arranged to be baptised Sarah Boom in Kingston on 13 Jan 1783. Her birthdate is listed as 9 Apr 1754 at her baptism (making her about nine years younger than Christian). After that, all their children are listed "of Christian Boom and Sarah Boom". 'Marriage by baptism' doesn't seem to have been a common practice, so there must have been a strong bond between them.
After Christian died, I don't know what happened to Sarah. There are later references to Sarah Boom but none may be her. In the early 1800s, a Sarah Boom (free quadroon) is listed as the partner of James Gordon (free quadroon) in Kingston, but that's unlikely to be her because Christian's Sarah was a free mulatto. On 18 Mar 1818 a Sarah Boom, pauper, was buried in Kingston, but again there's no mention of her being a Mulatto.
In 1809, a Sarah Boom (25 years old) is baptised as a slave of William Hall (more of him later) in St Andrew but she couldn't possibly be Christian's defacto. On 21 May 1821, Sarah Boom, a negro (probably a slave) married John Thompson, also a negro (probably a slave) in Kingston.
The known children and grandchildren of Christian Boom and Sarah Pynes / Boom have all come from the Kingston Parish Register. They are:
Benjamin Boom b. 6 Aug 1772, bap. 13 Apr 1773 , bur. 19 Mar 1774
William Boom b. 28 Jun 1775, bap. 10 Aug 1775
Benjamin Boom b. 16 Aug 1777, bap. 27 Dec 1777
m. 24 Apr 1802 Mary Crimble? Elletson?
Christian Boom b. 15 Feb 1805, bap. 30 Mar 1805, bur. 1 Apr 1805
Dorothy Boom b. 4 Jun 1779, bap. 5 Aug 1780, bur. 2 Mar 1857
defacto Joseph Threlfall
Joseph Threlfall b. 19 May 1802, bap. 7 Jul 1802
Barbara Boom b. 18 Jul 1781, bap. 12 Oct 1781
m. 13 Aug 1814 John Bromfield (a free mulatto)
John Bromfield b. 29 May 1815, bap. 6 Jun 1815
Daniel Boom b. 22 Dec 1785, bap. 22 Dec 1785
Richard Boom b. 9 Nov 1787, bap. 13 Oct 1790
John Boom b. 3 Jul 1790, bap. 22 Sep 1792
Florence Boom b. 25 Oct 1792, bap. 23 Sep 1793
Dorothy Boom was living at James Street Kingston when she died (in 1857) and was buried on "Spring Path" whatever that was.
Boom was a very rare name in Jamaica in those times so is easy to trace, but there are still a few unfilled holes. I've mentioned Sarah Boom (free quadroon) who had a liaison with James Gordon (free quadroon). They had at least three children, John, John & Maria. Another missing link is a Mary (or Marg) Boom who died as an infant and was buried 4 Sep 1766 and a Christian Boom (mulatto) who was buried 22 Jun 1818.
From the above, it appears that I'm only just scratching the surface of what may turn out to be a large group of descendants. There are quite a few Bromfield / Broomfield surnames later, but very few Booms. However, I did notice a Mary Sophia Boom who married William McWhinney in Kingston on 27 Feb 1856.