1861 census has the family at Barbrush Farm, Dunblane and comprising:
John Sinclair head age 43, overseer of farm of 215 acres 5 labourers 1 boy, born Blackford
Elizabeth Sinclair wife age 37, born Auchterarder
Charles H Sinclair son age 14, born Auchterarder
Elizabeth Sinclair daughter age 12, scholar, born Crieff
Mary A Sinclair daughter age 9, scholar, born Crieff
John Sinclair son age 7, scholar, born Crieff
William Sinclair son age 4, born Dunblane
George Sinclair son age 1, born Dunblane
They are also in the 1851 census at Milnab, Perthshire:
John Sinclair head age 31, ag labourer, born Blackford
Elizabeth Sinclair wife age 26, born Auchterarder
Charles Sinclair son age 4, born Auchterarder
Elisabeth Sinclair daughter age 2, born Crieff
FamilySearch has a marriage in August 1846 between John Sinclair and Elizabeth Halley, with banns at both Auchterarder and Blackford.
ScotlandsPeople, pay to view site, should have the actual OPR images for the marriage entries, and you can also view the actual census images there too. It also has images for civil birth, marriage and death certificates post 1855 to download.