Thank you ever so much for taking the time and for replying. It is greatly appreciated. You provided the key information that I was desperately seeking: Mary Stewart's maiden name. I did verify the marriage record for Lizzie that you gave. I found it on LDS, FamilySearch.org.
You have done more than enough; you need not proceed any further.
Again, many thanks. It is always rewarding to cross paths with an excellent genealogical researcher