There is nothing in the Ervin Bible mentioning a McCalister connection. That was an assumption from a family history book. John Allison and wife Ellin Hamilton, their son Robert Allison/Ellison and wife Sarah Spence -were- once on profile as parents and grandparents of Dr. Ellison, however, no source was provided for some reason and they got detached. The main source is the Ervin Bible which is discussed in detail on Wikitree profile of John Allison or Allison--6155. The bible says these Ellisons were in Lanarkshire, Scotland. There is supposedly a DNA link between the Lanark group of Ellisons and Dr. Ellison, see Wikitree profile for Gerard Robert Ellyson or Ellyson--39, then scroll to DNA link.