Hi there, I have some information about Richard Caplin, b.1878 Lewes, a merchant seaman by profession, who was son of Richard Caplin & Susan Burfoot, so brother of your great grandmother.
My information relates to his wartime experiences. His ship was sunk in the summer of 1940 (he then being aged 62/63)& for some time he was presumed drowned. However he had been taken prisoner and spent the rest of the war as a POW in France and Germany, latterly at the Milag camp for Allied Merchant Seamen. You will see his POW photo at Milag on a couple of the ancestry.co.uk public trees (e.g Caplin / Leaton).
I believe he was married and did have a family - have been trying to make contact with his family/direct descendants, so far without success. Perhaps you are in contact with some of them ?
Feel free to get in touch.