Hi Jean,
Re... "Could Harriet have been married before to a ? Bradshaw? Also, I wondered if George Smith is her brother-in-law. "
Yeah, I am not sure, how this SMITH family cone to be so closely related, in Newcastle NSW.
Harriet BRADSHAW, seems to be the mother of William HOLMES, as per the documents that you have. I would assume that BRADSHAW, is her maiden name.
I wonder, if Joseph HOLMES, married (or was a defacto husband) to Harriet, after Harriet, had a couple of children?
Mary