On the marriage certificate for Sophie and George it shows his father as being deceased (Alfred John Mills) possibly died 1903 his mother being Maria McNamara died in 1929.
George MILLS born 1885 Sandhurst/Sandridge Victoria to Alfred John MILLS and Marla (Maria?) McNAMARA regn #13505.
1903 electoral roll has Alfred John, Maria and Kate MILLS at Lucan St, Bendigo. Alfred was a cooper.
1909 shows Maria, Arthur Thomas, George, Kate and Mary still at Lucan St.
1914 shows Maria and Kate at 30 Lucan St.
1919 and 1924 shows as above but also Arthur Thomas and Mary next door at 28.
There was a birth for Alfred John MILLS 1863 at Sandhurst reg #10516 to Alfred John MILLS and Honora MULCARE. They married 1858 reg #1981.
Honora Agnes MILLS nee MULCARE died 1874 Victoria reg #2943.
Alfred snr died 9 April 1903 at Bendigo aged 75. See Trove article:
http://trove.nla.gov.au/ndp/del/article/9800722?searchTerm=%22alfred%20john%20mills%22&searchLimits=sortby=dateAscAlfred jnr married Maria McNAMARA 1875 reg #3097.
That's about it!