Thanks to everyone for your help, I believe that Zebulon did in fact die between censuses, like his elder sister Ruth, but she did at least show on the 1871. The idea Gaie of checking the 1911 census to establish how many children born to the marriage is most helpful; strangely I had done this with my grandparents' marriage , as their family is oddly spaced, births 1897, 1898, 1903, and then nothing, my grandmother was 31 when my mother was born in 1903 so I would have expected at least 4 more! I did not however think laterally enough and check for the information on my greatgrandparents marriage, but of course it should be there. Thanks again,
Roger
