Hi Moston, good to make your acquaintance. Looks like we're cousins, albeit somewhat distant. Betty (Mary's younger sister) is my great great grandmother.
Since you haven't made your three-post quota yet you can't PM, unless I'm mistaken, so feel free to ask more questions here. How much do you know about Mary's family? Her father Samuel was a pork butcher, born in Wolverhampton as best I can find out - spent his professional butchering years at Black Lion Court, Long Millgate, Manchester. From what I've read, there were pig enclosures out in the street all along Long Millgate at that time, so presumably he just had to walk out his front door to procure his livestock. He died in 1859 of heart problems (at least that's the result of my attempt to decipher the terminology used on his death cert, I don't have it in front of me and don't recall the precise terms used), which is of course the only way a good pork butcher should go.
JustKia has identified Samuel's wife Betty (aka Betsy aka Elizabeth) Knight above.
I'd be interested in hearing about William and Mary's family - I haven't looked very hard to learn much there, on the assumption that looking for Davies's is going to be hard work as it's a common name (unlike Wimbush). Betty's husband Patrick Connaughton moved to Salford/Manchester from Wrexham, Wales, so when I see the name Davies I immediately wonder whether there is some other connection there, but I don't know any details.
Tim