Hi meryll
Welcome to RootsChat!
It sounds possible that your William Pritchard could be the one mentioned amongst the twenty-eight. As for the Matthew men mentioned, as one had the unusual name (surely!) of Israel, that might help you find if he was related to your GG.Grandmother.
Since my original posting, I have found that James Oliver, did have children when he died. I did know that he was married but not that they had any family. I have been in a touch with a decendant from his side, although she knew nothing about the tragedy of the Royal Charter, so was able to give her the information I had.
I found the info, to get me started, from a hand written family tree that a late cousin of my mum's had done, many years ago. It has been a great help
and so interesting (as well as sad!) to find out what happened to this family.
As well as these two brothers dying in such awful circumstances, their parents also lost another two sons, within three years of each other, both at the age of two years........tragic!!! Mind, their mother went on to live well into her 90's, even after all the grief she must have suffered.
Hope you manage to find if your Pritchard and Mat(t)hew families were connected.
justmej