When William James Aller was born in 1862, in Greendale, New South Wales, Australia, his father, William James Aller, was 35 and his mother, Susan Goodsir Hayes, was 22. He married Susannah W Purnell on 27 February 1889, in New South Wales, Australia. They were the parents of at least 6 sons and 1 daughter. He died on 4 December 1943, in Marrickville, New South Wales, Australia, at the age of 81, and was buried in Rookwood, New South Wales, Australia.