Paul Dawn married Mary Ann Clay and then Hannah Clay in Jun 1860. There is a little conjecture in the conclusion that they were sisters. The GRO marriage index for his 2nd marriage only has two men and three women on page 491, however it looks as if Hannah was wrongly indexed, as she appears in isolation on page 497 of the Bingham volume 7b.
James Dawn b. abt 1791 just scraped into the 1841 census (Surgeon, 2nd Dn Gds at Sheffield Barracks) shortly before his death in 1843. Linked him to his surviving family through the British Medical Journal Apr 24 1858 page 342 (marriages) which is searchable for free. See the marriage of Frances Elizabeth Christiana Dawn. It identifies her father as Surgeon H.M. 2nd Dragoon Guards.
There are biographical details for James in Hartís Army List 1840, which is published as a Google Book
|Wm. Fredk. Dawn b.1831 Croydon, Surrey was foreman at a soap works in West Ham by 1881, which belies his more glamorous past. The book by Roy Dutton is available from Amazon. He married later in the same year|