According to the 1881 census George (47) and Jean (41) Craik, both born in Brechin, were at 35 Nursery Feus, Forfar, with daughter Mary Jane, 17, son John, 15, son David, 9 and daughter Margaret, 3. George was a tenter in a factory, Mary Jane a powerloom weaver, and John an apprentice cabinetmaker. The two elder children were born in Montrose and the younger in Forfar.
According to the International Genealogical Index at
www.familysearch.org George Craik and Jean or Jane Mitchell were married in Brechin on 9 April 1858 and had five children
James, born Brechin 15 July 1859
George, born Brechin 31 March 1861
Mary Jane, born Montrose on 17 June 1863
David, born Forfar 11 May 1871.
The IGI stops in 1874/5 before Margaret was born.
John, born Montrose on 12 January 1866
It looks as if James Craik, aged 21, born Brechin, was a grocer's assistant boarding with the family of Isa Wallace in 43 Dishlandtown Street, St Vigeans. This address is in the part of the town of Arbroath which had expanded into the parish of St Vigeans.
The 1841 census, transcribed at
http://www.freecen.org.uk/cgi/search.pl, lists George and Jean Craik, both 40, at Path Wynd, Brechin with Helen, 15, David, 15, James, 10, George, 7 and Isabel, 1. (Adults' ges in 1841 were rounded down to the nearest five years) The IGI lists their proclamations on 12 July 1823 at Laurencekirk and 1 August 1823 in Brechin, and their family included
Helen, baptised 14 November 1824
David, baptised 20 November 1825
Jean, baptised 1 April 1827
Mary, baptised 7 June 1829
James, baptised 12 December 1830
George, baptised 31 October 1833
Isabell, born 24 June 1839
all in Brechin
You can, and should, confirm all the information you already have at
www.scotlandspeople.gov.uk, where you can download birth, marriage and death certificates, and also pre-1855 baptisms and proclamations of banns of marriage, and the 1841 to 1901 censuses, for a modest fee. Bear in mind that the pre-1855 ones are not nearly as informative as the later ones. Start with William Bell Craik, if he was born in Scotland, and work back in time.
You should also be able to find death certificates for both Georges and both Jean/Janes, which should confirm their parentages.
Ancestry may be OK as a pointer, but it doesn't have any original records. The IGI is a superb finding aid, but it has many drawbacks, not least that it contains a lot of potentially misleading disinformation. Anything 'submitted' to the IGI must be viewed with great caution. It is essential always to consult the original record for anything you find on Ancestry or the IGI.
HTH