Oh wow, reading your post has given me goosebumps!

Thank you so much for replying to this thread, it's the first time I've ever made a connection with anyone else during my research

Am I right in thinking that your Sam is the brother of Cammack b.1807, and that their father is
William Brackenbury Lamyman b.1785?
The only other Samuel I have in my records is a son of Cammack & Martha, and a brother of George, who was born c.1840, but I do recall coming across your Sam several times during census searches, along with the Hilton name you also mention. I guessed they had to be related somewhere along the line.
I have since found, on the IGI records, Cammack's christening on 20 May 1807 at Coningsby, with parents William Brackenbury Lamyman and Elizabeth ??, and I've also found William's christening on 18 July 1785 also at Coningsby, with parents Amos Lamyman and Betsey ??, but that's about as far as I've been able to go back at this point. Confirmation of those facts so I know I've got the right people would be great if you have that information. I would also love to see a copy of William's(?) will too if I could.
BTW, who are Joseph and Rebecca? are they related to your side? I found them on the IGI on various christening details but couldn't tie them in to anyone I was looking for.
The photo you have of Sam and his family, would that possibly have Cammack on it too? (assuming I'm right about them being brothers of course) and if so, would you happen to have a copy or be able to scan it so I could see it please?
I think it's quite possible that George did live in York at some point as he seemed to travel around Yorkshire a fair bit before settling in Huddersfield. May I ask how you discovered this address?
Right, I think that's enough questions to be going on with, I'm just so excited to have found someone who shares some of my own ancestry

Many thanks again, this is fantastic!
Kind regards
Paula