I have had an email of a distant cousin, who is related to William, who told me he married Emma RUSSELL in Australia in 1864 and went on to have about 6/7 children, one of whom was called Arthur Rutley Williams, c1870 although she doesn't know when he arrived or when he died....
There is no marriage in Vic in 1864 that you mention
Marriage
WILLIAMS William Blackman Born
BristolRUSSELL Emma Born Durham
1887 Reg#1634
And the births prior to their marriage
WILLIAMS William Henry
Father William Blackman Mother Emma RUSSELL
At Sale 1866 Reg#10792 Died 3 years 1869 Reg#7738
WILLIAMS Frederick Charles
Father William Blackman Mother Emma RUSSELL
At Sale 1868 Reg#25897
WILLIAMS Emma Isabella
Father William Blackman Mother Emma RUSSELL
At Sale 1870 Reg#25823 Died 16 weeks 1871 Reg#2315
WILLIAMS John James
Father William Blackman Mother Emma RUSSELL
At Sale 1873 Reg#5239 Died 1 year 1874 Reg#4396
WILLIAMS Arthur Rutley
Father William Blackman Mother Emma RUSSELL
At Richmond 1880 Reg#11172
WILLIAMS Alfred Edward
Father William Blackman Mother Emma RUSSELL
At Collingwood 1882 Reg#15103 Died 2 years 1884 Reg#8514
WILLIAMS Frank Russell
Father William Blackman Mother Emma RUSSELL
At Collingwood 1888 Reg#2034
http://nla.gov.au/nla.news-article7431673The Argus 8 Feb 1876
........... William Blackman Williams, draughtsman, gave evidence that when he entered the premises the heat and smoke were very excessive. It took seven or eight minutes to get the fire out. .........
WILLIAMS William Blackman.
Status Married Married 1887 Emma RUSSELL
Mentioned 2007 publication
Place Sale district, Victoria
Pioneer index for Sale & district 1838 to 1900.
Sale & District Family History Group Page#447
WILLIAMS William
Occupation Surveyor. Occupier.
Event Rate Book 1876, 1877, 1879, 1880
Richmond, Victoria
Cando