I've looked for him in the 1851 census - he was "Near village" with his daur Ann Cottier aged 28 and her husband and family, so not much help.
In 1841 he is aged 55 Shoe M., with Jane Kneale aged 12, living in Ballavastin.

I can't see any mention of William Kneale in any of the Ballavastyn sections. There were a John Kneale and his son John Kneale living in one of the Ballavastyn cottages at one time, but no other information about them.

Sue