I can shed a bit of light on this one - although it might confuse you all further!! The family at 2 Robert Street is my family. Charles Andrews, the cab driver, was married to Emma Crabb in March 1850, and in 1851 they are living with Emma's mother, Elizabeth Crabb, who has been dittoed under Charles Andrews! Emma's age and birthplace are correct. Also living at the house was Emma's sister, Mary (my great-great grandmother) and her husband James Ford and their children. I searched in vain for Charles and Emma in the 1861 census only to find (I think) the same Charles with a wife called Kezia aged 40 - but then I found a marriage between Charles and Kezia Beckwith in 1850 ... which makes no sense - unless Charles had two wives!!!