The penny has just dropped. Except for the link between Amilia and Joseph being brother and sister
the remaining Lewis family et al is not related to me at all. The only person that links this family to the Richards family is an unknown Richards and Davies that we have no details for, who had a son, Joseph in 1794. Joseph was a nephew of Edward because his father was married to Edward's sister.
They lived at Ynysberfedd, owned by George Richards, (and later his brother) simply as tenants.
I think that the time and effort spent on this bit of the family didn't amount to much, but there we are. No pain no gain, as they say. Lledrod is particularly poorly served having hardly any birth, marriage and death records for the 1700s so that guesswork and hypotheses has to take its place with dire results. This will be the first time that I will be writing, "Unknown Richards" in my direct-line tree to the Rev. John Richards. Shame on me.
Regards, Peter