RootsChat.Com

My 'mistake'.  If you Google "Martin Robert Douglas Crossman" and then open "Re CROSSMAN John" that will take you to a different site "genforum....." where you will find the ref to Shirley C.
Alexander C was a middle son of Robert and Alexander's grandson was Sir Douglas Peter C of Tetworth Hall, making Sir D a second cousin of your mother Cecille.  My wife is also a second cousin of Sir D and your mother.  I don't think the Crossman family tree is literally on rootschat.  It must be well over ten years ago that my wife and I took her father ( the other James Hiscutt that I mentioned) and mother to an open day at Tetworth Hall and it was then that we acquired the booklet  of family history that Sir D had compiled.  It consists of about 28 pp of A5.  If you care to send me a personal message with an email address, I can try to email a PDF copy to you - it takes two or three goes cos the file is so big.  Incidentally,  Sir D's compilation shows 13 children of Robert.  As a further aside, my wife was one of 43 beneficiaries of an intestate first cousin so there are quite a lot of Crossman derivatives about!

My wife's cousin, Sir Douglas Peter Crossman, is also a direct descendant of Robert Crossman of Holy Island.  The info you have given in your PM to me clearly shows there is  link.  Sir Douglas produced a quite detailed genealogy and we have a copy.  There are references to Devon and to the Mann, Crossman and Paulin brewery and to a William marrying Margaret Gilchrist in Douglas's efforts.  We have some photos of Robert and Sarah's graves on Holy Island.  If you care to give me your address via a PM, I can send you a photocopy of Douglas's material - it runs to about 28 pages (A5).  Bob