There is a probably correction to the parentage of Hyacinthe Gabrielle Roland (a great great grandmother of the Queen Mother), who appears at: http://www.shamema.com/pafg428.htm#17685
Hugh Farmar, in "A Regency Elopement", pp.169-171 (1969), quotes correspondence indicating that Hyacinthe was not the daughter of her mother's husband, but was the product of an affair with a cavalry officer named Christopher Alexander Fagan: http://www.medievalgenealogy.org.uk/cp/vol9.shtml#mornington