This isn't of any help to you, but just to keep your spirits up, don't give up hope!  My grandfather's parents emigrated to Canada in the 1870's with their 7 chldren, they returned to Liverpool fairly soon, leaving the eldest daughters in Canada as they had married there.  I had no idea what any of the married names were, the only clue I had was a photograph of my grandfather with one of his sisters and her husband, and a half written letter that had been left by his bed when he died in 1921, addressed to 'Dear Polly' at Westminster Road Toronto.  A couple of years ago I saw a message on the ancestsry message board enquiring about a Mary Pritchard born in Liverpool the same year as his sister, so I emailed, and sure enough it was one of her descendents!  This was confirmed by our exchanging copies of photographs where she was wearing the same dress as in my photo, and a Toronto census showing the famly living in Westminster Road.  Just keep on looking, the information is out there someplace.