me again
I have looked thro the 1871 & 81 census & I think that the freeBMD's give a bit of a clue here:
Birth - Charlotte - Blofield Mar 1851 - 13/20
Marriage - Matthew to Sarah Blayes - Norwich Jun 1848 - 13/451
Death - Eliza - Blofield Sept 1851 - 13/11
Death Charles (age 37) - Norwich Jun 1848 - 13/451
Death - John (aged 18) - Blofield Jun 1870 - 4b/131
next stage, ignoring the surname altogether (found also Hornor & Homer & Homar), in 1871 there is only one Sarah born c 1822 Hemblington and her surname is Snowley & her family are registered under that so cannot be her - tried the same with John & Matthew & nothing - done the same for 1881 & zilch so, I think that young John dies (as above) & Matthew (although I cannot find a death registered, but thats not unusual)
On the 1861 census, there is a Charles showing born c 1831 (if Eliza died earlier this would make sense) +, there is a Charles born c1857 Blofield shown as a son to a John & Sarah Horner who, could be looking after him/lived with them if the Eliza death is correct & they would not necessarily have put him down as adopted etc.
Supposition thus far on my part but worth digging into more