Two of the girls Martha & Elizabeth Jane Cox married and they can later be found living/died in Bath Somerset - do you have these details?
Yes, Ladyhawk, thank you, I have those details. Elizabeth Jane is my 2 x GGM
For info, regarding the other children:
Son John COX (b 1867) married Clara STRAIN
Son Joseph Daniel COX (b 1870) married Bertha Mary OSMAN
Son Robert COX (b 1878) married (1) Edith Elizabeth CADGE & (2) Augusta FURBER
Son Arthur Herbert COX (b 1887) married (1) Ethel DANSIE & (2) Clarrie Moss FRANCIS
I have nothing for daughter Ann COX (b.1862) past the 1871 census
I have nothing for son Thomas COX (b 1869) past the 1871 census
I have nothing for son Frederick William COX (b 1875) past the 1891 census
With the early deaths of Edmund and Sarah, perhaps these three make up the five children that have apparently died by 1911 but where is the 12th child? Given that they have turned up on no records so far, I would be inclined to say that "missing" child might be one of the five dead??
I definitely need to spend some more time on the deaths and burials to try and confirm.