ALLMARK - Chester, Early to mid 19th Century

[kellisto]

My gg grandmother was Annie ALLMARK, b 1881 in Manchester and her father was George ALLMARK b. 1839 in Chester.
 
I know that George's parents were Robert (1814-1849) and Sarah ALLMARK. According to the 1851 census (thanks to Peter Bennett), Sarah was living on Trafford Street, Chester, with her children: George (b. 1839), Hannah (b. 1845), Robert (b. 1847), and Catherine (b. 1849). She also lived next door to Thomas and Sarah Allmark and their children: Benjamin (1838-1898), Mary (b. 1833), Thomas (b. 1836), Ann (b. 1842), and William (b. 1846).
 
I suspect that Robert and Thomas were probably brothers.
 
Does anybody recognise any of these people?
 
If they do mean anything to you, I would very much like to hear from you.
 
Many thanks
Karl Elliston