I thought you might find this posting by Elizabeth Manners useful. It is located under Lord William Manners.
In reply to this one, Robert and Elizabeth had 11 children, not 8. They were (1) Lucy, (2) Robert, who died ? 1796, unmarried - he was a Lt. in the 15th Foot, (3) Thomas, born 17?74, d. 1834, married Mary Rush and had 1 son and 1 daughter - he was a Major in the 49th Foot; (4) Russell, (5) Frances Augusta, (6) George, (7) John Lewis, b. 1779, d. 1851, married Elizabeth Spotswood and had 2 sons and 4 daughters - he was a Lt. in the Marines, (8) William Henry, (9) my ancestor Henry Herbert, (10) a daughter, possibly called Elizabeth, who died unmarried, and (11) Maria Wilhelmine.
All this is according to the research, over many years, of my uncle Rodney Manners, now deceased, who spent his entire naval career truffling around in places like Jamaica (hence Sabrina Poole Brissett). My cousin Crispin Manners, who lives just outside Exeter, has his papers.
Best wishes, Elizabeth
I, too, descend from Robert and Elizabeth through their son George Manners.
George Manners (1778–1853) was a writer and editor who served as British consul in Boston, Massachusetts from 1819 to 1839. Manners was born in 1778. He was called to the bar, became a noted wit in London, and was in 1807 founder and one of the proprietors of the Satirist, or Monthly Meteor, a venture in scurrilous literature, issued monthly, with a view, it was claimed, to the exposure of impostors. The first issue appeared on 1 October 1807. At first coloured cartoons were attempted, but it is stated in the preface to volume II that these were dropped owing to the artists having disappointed the editor. In 1812 Manners parted with it and the publishing offices at 267 Strand to William Jerdan, who tried his luck "with a new series, divested of the personalities and rancour of the old." Despite the bad bargain which he made over this purchase, Jerdan describef Manners in his Audtobiography as "gentleman in every sense of the word, full of fancy and talent, acute and well informed". The periodical ceased in 1824. In 1819 Manners became British consul at Boston, and held office till 1839. He died at Coburg in Canada on 18 February 1853.