ShaunJ
You mentioned that you found the Witnesses of this wedding as M Theodore and S Quinliven. How did you go about finding that? Is it possible there are witnesses for the Birth of Joseph as well?
I can't see any marriages between them either. Perhaps they married in another country, but then there's the Quinliven witness in Rangoon.
I thought a candidate for M Theodore would be Manuel Theodore who seemed to born in the 1810's and was mentioned as the father on many of his born in the 40's and marrying in the 50's and 60's in Rangoon. Though it's a stretch to think he'll be present at his daughter in Law's 2nd wedding if indeed his son was one of those.
I can't seem to find a Theodore dying that matches the bill. There's an Arthur Theodore born to Parents Samuel and Marie Theodore in Rangoon 1879, and mention of am Arthur Henricus Theodore dying Rangoon 1880. Might be the same child. Samuel could be the husband, but I can't attach him to anything. The baby puts the parents at least old enough to have been born in the 50's.
Mary Theodore on her Marriage cert. b. 1854 apparently.
The witnesses on the Marriage cert could be coincidental. The Quinliven factor does make a good case for it being Mary, and her having family living in the area at the time.