Which Ellen am I looking at?
Sorry Jeff but I don't know. I was just dabbling on Google and put Tyntwca in as I was wondering if the property was still there but noticed that link on Ancestry and thought that you might be interested in it.
However when I had another search for the property I saw that you were already aware of it by your posts in Roots Chat.
It's difficult trying to trace people when they had names like Ellen and Robert and can appreciate how much time that you have spent looking for them. If there are any Baptism records in the Conwy Registration District then it will only give you the names of the children and may not help in your search for the present day family members.
You have a place and date of death for Eric Roberts and would suggest that you phone the Bangor Crematorium and explain the situation to them and if they don't have the records then they will point you in the right direction.
By the way, have you done one of those DNA tests that they do on Ancestry or My Heritage? I did one last year and put all the people in that I definitely know as being related to me and you'd be surprised at what turns up and people getting in touch.