I am now fairly certain that Marshall Godolphin Cobbe Master R.N. and his wife Elizabeth Catherine Hammond (married South Mimms Jan 1816) had at least two children -
a daughter Frances Emilly born/bapt c1819 and as previously mentioned;
Charles Marshall Godolphin Cobbe born/bapt 1821 and dying before about 1837. Elizabeth lived until c1873 dying in Islington and Emilly lived until 1898 dying in Brighton.
For some of the time they lived together. Details of locations are listed in 19thC census returns - look out for spelling errors in the transcriptions.
In 1841 Elizabeth was with her sister in law Charlotte Godolphin Clay (nee Cobbe)'s family in Lambeth. Elizabeth died c1873 at the age of c 79 years.
Frances Emilly was born in Strand on the Green, Kew - Middlesex (slide to the left just before crossing Kew Bridge from "Chiswick") and she died, in Brighton 1898. It appears she never married but with a Caroline Cobbe was involved with the Godolphins Girls Scool, Salisbury, as were many of the Cobbe anad Burslem family decended from the Godolphins. Not sure if Caroline was Emilly's siter.
I am pleased to say that I have now started to assemble my http://godolphins.org.uk
web site having hopefully settle on a design layout and hope to complete pages on Marshall Godolphin Cobbe Master RN and his brother Lt Charles Cobbe RN within the next week or so where research to date will be described in rather more detail with sources and acknowledgements etc. You are all welcomd to visit.