Hi Justin,
This sounds like a perfect challenge for Rootschat.

I would suggest you post a new question in Beginners telling us all you know (but nothing about living people of course). We will need as much as you know about each person including name, place and date of birth if possible.
If you do decide to post a question, please post a link to it here so we can come over and help too.
By the way - I think the man you are talking about is Mike Caswell and he is still very active in Caswell research. He has been gathering Caswell data for many years (long before I started my quest). He is actually giving me a welcome hand right now with my Dorset Caswells.

Good luck.
Paul