I have in my possession a copy of the Marriage settlement of Michael O'Sullivan to his son Richard Sullivan who married Mary Ann Trenwith in 1821. They were my GG-granparents. Among the properties transferred was the farm at Cappaleigh where my father and grandfather lived.
This document lists MA's father as William Trenwith.For years we thought her father was Henry (ref. Acton's book), but there is ample evidence (in addition to the above) that he was William.I have attempted to contact Helen by e_mail, but apparently have an outdated address.
I have much more information to share.Please contact me at: MikRobOS@aol.com