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Hi. I may be able to help in a small way. Edward de Lautour who married Catherine Sconce was my great-great grandfather. It was his grandfather Count Francis Joseph Louis Lautour de Quercy who was the first of the family to go to India in 1777. The Count's son Joseph Andrew was a military officer in England until 1814, and his son Edward was born that same year. Edward went to Calcutta at the age of 23 and joined the East India Civil Service. He married Catherine in 1837 and later rose to become a judge in the Supreme Court in Calcutta. I can't help with the other names, although Count Francis Lautour had a son before his marriage, and called him Joseph Francois Louis Lautour, so it is possible I guess that he was the father of your Louis Latour. (That last bit is pure speculation!)
Good luck with your research.