James was married previously and on the 1850 US Census his wife Jane and children are in Wisconsin. I wonder if he had one of the children with him in Geelong.
http://www.cornwall-opc-database.org/search-database/STANAWAY James Batchelor Of this Parish
BROWN Jane Spinster Of this Parish
16 Oct 1834
Parish Or Reg District Probus
1841 Census HO107/148/5/8/33/13
Living at Probus, Cornwall
STANAWAY James 30 Mason Born county
STANAWAY Janes 30 Born county
STANAWAY Ellen 5 Born county
STANAWAY Samuel 1 Born county
and a few doors away
STANAWAY James 60 Mason Born county
STANAWAY Ellen 50 Born county
STANAWAY Caroline 18 Dressmaker Born county
STANAWAY Mary 15 Born county
STANAWAY Hannah 10 Born county
GILES Elizabeth 60 Seamstress Born county [Is this Ellen/Eleanor's sister?]
Marriage in the Parish of Probus
STANAWAY James
GILES Elenor
10 Jan 1805
This looks like James baptism in the Parish of Probus so born 1806. Eleanor aka Ellen.
http://www.cornwall-opc-database.org/search-database/STANAWAY James
27 Dec 1807
Sex - son
Father James
Mother Eleanor
Notes age 14 weeks; mother formerly TEALS - could this be
GILES? James' obituary refers to him as James G STANAWAY.
James and family emigrated to Canada prior to living in Wisconsin.
1850 US Census
Living at Shullsburg, Lafayette, Wisconsin
STANAWAY Jane 41 years Born England
STANAWAY Ellen A 14 years Born England
STANAWAY Samuel 10 years Born England
STANAWAY James 6 years Born Canada West
STANAWAY Alice 5 years Born Canada West
STANAWAY George W 3 years Born Wisconsin
STANAWAY Henrietta 9 months Born Wisconsin
You possibly have all this but I was curious after finding James' obituary.
Names of James parents on this thread
http://www.rootschat.com/forum/index.php?topic=715629.0Cando