Hi flametree5
Welcome to Rootschat

I was going to ask, where they were in the UK Census post 1873 (per IGI they had a son James born in Govan 1874 who may have died before 1876) - but I see they went to Australia, arriving on the "Star of India" in 1876:
Passenger list:
James CRAIG 23, Blacksmith from Lanarkshire, son of James & Christine, Presbyterian
Cecelia CRAIG 20, from Lanarkshire, dau of Charles & Janet
Charles CRAIG 1, (who died in Port Jackson - apparently at or soon after arrival?)
Found that here - a cousin? on Rootschat is rsearching the same line

:-
http://www.rootschat.com/forum/index.php?topic=389228.0That topic identified James:In Govan in 1871 - a 19 year old blacksmith listed as brother in law to Thomas Muir (wife Mary). James and Mary list births in Partick.
And I think the following is his family:1871: 3 Graham Street, Partick, Govan, Lanarkshire
Parish 646/3, ED 9, pg 22, HS 138
Head: Thomas MUIR 30, Iron Ship Builder, b Glasgow
Wife: Mary MUIR 25, b Partick
Dau: May (or Mary?) MUIR, 5, b England
Brother-In-Law: James CRAIG 20, Blacksmith, b Partick
1861:155 Dumbarton Rd, Partick, Govan, Lanarkshire
Parish 646/2, ED 23, pg 35, HS 207
Head: James CRAIG 46, Spout?? Merchant? b Greenock, Renfrewshire
Wife: Mary CRAIG 45,b Inchman, Renfrewshire
Son: William CRAIG 21, Ship Carpenter, b Kelmhaugh, Lanarkshire
Son: John CRAIG 17, Ship Smith?? (App), b Partick
Dau: Mary CRAIG 15, b Partick
Son: James CRAIG 9, Scholar, b Partick
Dau: Jessie CRAIG 7, Scholar, b Partick
Niece: Mary BUCHMAN 21, Domestic Servant, b Partick
1851: Castlewalk St Mathews, Partick, Govan, Lanarkshire
Parish 646, ED 9d, Pg 34, HS 117
Head: Christina CRAIG 33, b Glasgow
Dau: Isabella CRAIG 12, Scholar, b Greenock, Renfrew
Son: William CRAIG 10, Scholar, b Partick
Son: John CRAIG 7, Scholar, b Partick
Dau: Mary CRAIG 5, Scholar, b Partick
Charles KERR 25, Ship Carpenter, Journeyman, b Glasgow
1841: Partick Old Bridge End, Barony, Glasgow, Lanarkshire
Parish 622, ED 4, Folio 178, pg 13
James CRAIG 26, Ship Carpenter J, - N
Christina CRAIG 25, - N
Isabella CRAIG 3 - N
William CRAIG 1 - Y
John (CRAIG?? YUILLE??) 1 - Y
Ann YUILLE 10 - N
The 1841 can be found on FreeCen - apparently John age 1, his surname is not clear - it may be bracketed with YUILLE.
http://www.freecen.org.ukhttp://www.familysearch.org/eng/search/frameset_search.asp?PAGE=igi/search_IGI.asp&clear_form=trueIGI: MARRIAGE: James CRAIG and Christina MILLAR 21 Sep 1835, Govan, Lanarkshire
This looks like Christina MILLAR died between 1851 and 1861, and James remarried by 1861.
Cheers
AMBLY