Hi The Betty Alderson you mention in your message who married John Alderson and kept the Inn at Thwaite was the sister of my fathers Great-Great-Grandfather - Ralph Alderson born 25.12.1770 died 25.02.1822 married Mary Sandwick 22.12.1770.
So we share all the previous relatives!
I'll give you the information we have got to date: Ralph (above son of) Simon Alderson born 23.12.1742 died 22.06.1791 married Mary Scott 24.11.1767 son of Christopher A born 12.11.1720 died 27.05.1808 married Elizabeth Alderson 13.01.1742 son of Simon (Symon) of Keld born 1688 died 05.05.1771 married Angus Steward of Simonstone on 18.04.1719 son of Christopher (Cristopher) of Keld born ?1665/166 died 11.12.1713 - married unknown son of Symon of Keld born 29.11.1640 died 12.03.1670 married Elizabeth Metcalfe of Thwaite (daughter of Jeffray) on 15.01.1665 son of Simond married unknown of Byrtdale (Birkdale) who died 10.12.1658.
We got most of this information from the Alderson History Society (my parents are members) and we also visited the records office at Northallerton.I keep threatening to visit Muker Church to see if there is more information about the Simon who is buried inside the church!
I have a book from the library "Swaledale - The Spirit Speaks loud" and the number of different Aldersons is mind-blowing (and all marrying cousins and other Aldersons!)