Hi
I'm Michael Caines. The William Caines you ask about is my great grandfather. His son Augustus is my Grandfather and my father is Maurice. Both Augustus and Maurice were also born in Port Saunders.
To answer your question, I distinctly remember hearing as a child a conversation mentioning that William Caines is the son of Reuben Caines. I remember because the name Reuben seemed quite unique to me at the time.
From what I can tell, Reuben had a brother Michael and they were among the very first settlers in Port Saunders
Heres a link stating so
http://collections.mun.ca/PDFs/cns_decks/DA_Vol14_No03.pdfI'm of course not 100% certain but am passing along what I heard to be the case...
You asked this question 10 years ago...perhaps you know the answer at this point..:)