Thank you for your help, the story as I know it is as follows.
Sarah Freeman married Herbert Cureton in 1869 in Birmingham. They had 2 children and I think that Herbert then died. Sarah Cureton then married Ben Glissan and they had 3 children, one of whom is my "Glissan", Francis, who emigrated to Melbourne and appears to have been married 3 times, lastly to my great aunt. Francis also was a doctor like his father.
Sarah died in 1893 and Ben then married Sarah's sister, Mary Ann, the same month and year. They had a further 4 children together.
I don't know what happened to the other son Edmund Glissan yet, and I am still hoping for a lead on Benjamin Glissan's ancestors from Tipperary Ireland.
I will try and find information on Griffiths list, but any further assistance would be greatly appreciated.
David