I'm John Grimshaw, my mother's name was Hammill. I'm descended from Pierre's son James.
I have a public tree on Ancestry - john grimshaw family tree- which takes us back to the Franks and Romans - about 120 ad if you're not too fussy.
The link between Pierre and his ancestors was passed down to me years ago by an unknown Aussie Hammill so I would like to return the favour.
If you want to get in touch, my email address is: email@example.com