Hi dragonT
Many thanks for your message. Richard and David could well have been brothers. I guess we may never know for sure.
Do you, by any chance, have any details of David's birth/christening? As you can see, to date I don't know where or when Richard was born, but they may both appear on some parish register, which could give us a clue as to whether they were related.
Do you know the names of his children? Perhaps there are some names in common with those of Richard's children. As far as I can tell, Richard's children were Margaret, Louisa, Laura, Richard and John (don't you wish they had been called something unusual - much easier to trace!)
Best wishes
Filz