Michael and Mary were married in 1878 in Morar, Madhya Pradesh, India according to IGI records. Along with Elizabeth I have also found records for 3 more siblings, Catherine Lacy born 21 Feb 1871 in West Bengal, India, John Lacy born 21 July 1874 in Dum Dum, West Bengal, India and Patrick Lacy born 15 March 1877 in Chakrata, West Bengal, India.
I also know Michael was born in 1853 in Morar, India also.
Elizabeth married in Queensland, Australia in 1905 leaving for NZ shortly after where she lived the rest of her life.
I have been unsuccessful tracing this family any further back or from India elsewhere, I would love to hear from anyone who thinks they may be connected.