The information I have on John Mills is:
Born in London, approx 1820.
Father: John Mills (tailor)
Mother: Sarah Melton (?)
Married Elizabeth Chapple (nee Woods) in 1855. Married in Avenel, Victoria, Australia. His occupation is listed as 'tailor'.
Together they had eight children:
Jane - m- Thomas John Ford in 1875
John
Amelia
Elizabeth
Maria
Elijah
Matthew - m- Marion Hunter McKenzie in 1888
John and Elizabeth must have separated some time between 1867-1869.
John was still alive in 1888 as he is listed on his sons wedding certificate - occupation 'gentleman'
This is all I have managed to find out so far.