I have since found out that John and Louise are actually...James and Louisa. They were married in Old Mission Church in Calcutta West Bengal, India in April 1839. I still have found no information on who Louisa Duntze's mother was or who James Turner's Parents were. The story goes that James Turner came to be in India after working on a Clipper ship transporting ice to India from lakes in the US.
Any information you may have would be great to know.
Thanks, Janelle Steele