I was thinking about the Davies family last night and William and Catherine had 7 children including Henry by 1801, so that meant that there was a total of 9 people living together in the house.
At that time the entire population of Llandudno was just 318 so the Davies family accounted for roughly 3% of the total population.
From what information I have had a look at, Henry, David and David Edward all had sons and no daughters so the Davies surname must have been carried down through the ages and there must be a lot of people still living in Llandudno who can trace their ancestry back to Henry or his brothers.
I'm surprised that I've been unable to trace any burial records for the family, especially William, Henry and David but something may turn up in the future