Ruth, William Cashin & Ann Creer who married on 15 Feb 1793 in Malew are on the databases of the two John Creers, and I'm sure one will help when he sees your message. They also have information about Susannah Creer.
Ann was the daughter of John Creer and Esther Quirk. Her father John Creer died shortly after her marriage, in April 1793 in Malew - see the copy of his will on Brian Lawson's website.
Elizabeth Feisst has details of the QUALTROUGH connection with Creer.
Sue