Hi,
Thank you for the reply.
I thought i would have to obtain their marriage certificate- I was just hopeful that someone out there might be related and know the answer already. Also as I live in Australia, ordered certificates can take a while to get here, so i've been compiling a list of certificates I need, to than order them all at once- something that ends up being quite expensive.
I did think the same thing, that she seemed a bit late for the marriage. I have found only one possible match for this family in 1871 living in All Souls, Lancashire. It lists a Hannah Robinson (born abt 1816) as a widow living with Sarah Ann aged 12 and a Betty Robinson (listed as daughter born abt 1853 in Manchester). I believe this is them.
In the 1881 census Sarah Ann has left home and is now married and living with her husband.