Hello Francis
I've just recently joined rootschat and came across your message.
Mary Job (nee Brockton) 1761-1851 was married to my G-G-G Grandfather Henry Job, who's sister Ann Brockton married Joseph Bettinson as you mention.
From the UK National Archives documents online, I have been able to deduce that Mary Job, Ann Bettinson, Elizabeth Parker, John Brockton and George Brockton are mentioned in Elizabeth Brockton's extract of her will as her sons and daughters and concur with you that this Elizabeth Brockton is probably Elizabeth Rippon (1730- abt 1808) who married John Brockton on 12th May 1755.
What I am struggling to do at the moment is connect these generations with later descendants such as William Rippon Brockton. Perhaps, you could help with this?
Best regards,
Mike