carney (Carnie) and Duffy in Perth

[jcmcd]

I am looking for information on the Carney (Carnie) and Duffy families in the 1851 census for Perth.  I have them in i861 as follows:
Peter Duffy - 47 - Head
Bridget Duffy - 42 - Wife
Patrick Duffy - 20 - Son
Martin Duffy - 7 - Son
John Carnie - 26 - Son-in-law
Mary Carnie - 16 - Daughter
John Carnie's parents were deceased.  Their names were Thomas and Ann.  They may have been alive and in Scotland in 1851.