The Thomas Cail, who was a saw mill owner, died on 24 Jan 1881 in Weldford Parish according to the Daniel F. Johnson newspaper archives found at www.archives.gnb.ca
. He was in his 65th year when he died, putting his birth at approximately 1816. On the Kent County census of 1871, there is only one Thomas Cail born even close to 1816 and he was born in England and his wife was Jennie. The newspaper articles refer to Thomas' wife having died the year before, and Jennie Cail w/o Thomas William Cail, died 22 Jan 1880.
Jennie would be Jennie Irving b.c. 1825 in Scotland. Here is the family on the 1871 Kent County census. The story I heard is that Jennie Thurrot was babysitting for Thomas Cail's family when she became pregnant with his child. Given the size of the family and the birth dates of the children, that would certainly make sense, especially if the older boys were working in the mill prior to 1866 when Frederick Thurrot was born. But as we all know, that circumstance just provides opportunity, and not much proof of paternity.
Thomas Cail 341 M (Male) 55 England
Jessey Cail 341 F (Female) 45 Scotland
John Cail 341 M (Male) 23 New Brunswick
George Cail 341 M (Male) 21 New Brunswick
Jonathan Cail 341 M (Male) 19 New Brunswick
Thomas Cail 341 M (Male) 17 New Brunswick
Elizabeth Cail 341 F (Female) 15 New Brunswick
Christobel Cail 341 F (Female) 12 New Brunswick
Anne Cail 341 F (Female) 9 New Brunswick
Margaret Cail 341 F (Female) 7 New Brunswick
Jessey Cail 341 F (Female) 6 New Brunswick
Mary A. Cail 341 F (Female) 4 New Brunswick
Hope this is helpful.