Bax85, when you say you 'have Katherine's parents as George Westwater and Margaret Knowles' and 'have James parents as James Sherriff and Janet Wishart', do you mean that you have seen their death certificates and got their names from there?
I have been trying all weekend to locate the DC and census records again
The death of James Sherriff, aged 56, was registered in Dysart in 1873 and that of Catherine Sherriff, other surname Westwater in 1901, also in Dysart, aged 75. You can download images of both certificates from
www.scotlandspeople.gov.uk at modest cost, and thus confirm the names of their parents.
Always use wildcards in your search - sh*r*f* will find all variants of the surname.
James Sherriff, 44, born Kirkcaldy, is in the 1851 census at Mid Street, Dysart and in the 1861 census in Back Street, Dysart with wife Catherine and three children.
In 1871 James Sheriff is in Back Street, Dysart with Catherine and two children.
Catherine Sherriff, 58, is in the 1881 census at 111 Back Street, Dysart, alone.
All the above are from assorted transcriptions and indexes. You can (and should) download images of the originals from Scotland's People to check that there are no errors in the transcriptions.