Austin McKay, born 1881 in Balmain, N.S.W. and married Lillian Ratcliffe in 1910. (Lillian was my great aunt - sister to my grandfather, Joe Ratcliffe.)
Based on the many articles in Trove, it would appear that he was an eminent and popular architect for many of the buildings and structures for the Catholic Church of N.S.W.
Including as the architect for St Mary's Catholic Church, Casino, where his three nieces-in-law, the Ratcliffe girls were married: Josie in June, 1945, Phyl in February 1946 and Mary in October 1946.
The foundation stone for the new church was laid in 1939 and the church was opened in 1940.