The Thomas father of deaf Jony cannot be son of John + Isable - Jony is born c.1690 to be of age at time of court decree
If Thomas was a son of John by prev marriage then he rather than Charles would be heir - thus look at the putative link - in Cath als Bell's will which is sis-in-law Cath Mylrea (but we don't know her husband's name!)- but there is a Cath (?Cath Bridson) wife to a Wm Mylrea with a child bapt 1680 so there is at least one possible contender.
I'm also interested in why she wants her deaf child to be overseen by Jony Kinly w/o Thomas Corrin - they married 1680 tho Jony d shortly after Cath Bell