You said you and your siblings wondered where your Grandads family were.Well I am part of that, so it is nice to get to communicate with you. Do you have an email address or anything?That may be a more direct way of communication as this website is a public one isnt it? If you do, you can contact me on any of the following email addresses: email@example.com or firstname.lastname@example.org
I could send you some photos of your Grandad John's son; Henry.Henry was my great grandfather.He would have been your father William's half brother!!
If you want to write to me instead, i would be happy to communicate that way too.I dont know if you want to put your address on here though, so maybe emailing it would be more preferred?