Thanks for all your researching, I believe it has clarified my thinking.

It seems to me that the only possible link to Thomas Charles is through David James Charles, his brother. It appears that I need to find a link between John Charles (father of Eliza Charles (~22) who married John Jones in Merthyr in 1850) and David James Charles (and I think that link must be father and son).

Now, does anyone have any information about David James Charles (b ~1793) or any pointers as to where I can find out more about him? I have a note (not sure where from) that he might have been a physician.

many thanks again for the help

Regards

Bookman