I'm currently looking into this and have some info. Its tough going with these ones as records are not always complete. I wonder if anyone else is looking at this family.
For me it started with Mona Sheldon who married Richard C Hornsby in Madras 1926. Finally I found her birth in 1905 thus ending a series of misdirections from a similarly named person. Now I'm trying to figure out her parents Benjamin Joseph Sheldon and Mary who I believe is Mary Elizabeth Sheldon possibly nee Bennett but not sure yet!?
I also belive she has an older brother: Hertford Joseph Sheldon b. 27 Mar 1895 and a younger sis: Edna Muriel Sheldon b. 27 Sep 1909.