Hi Kim. David was killed in a gold mine 'cave in' in California.date not known. Wiliam spent his last years with his brother John & family in Wiota Winconsin. Mary Sweeney & her parents were Irish immigrants. Their son David, (one of eight) married Anna Flannery. You are correct, David was the son of John & his wife Elinore Clague. William, husband of Mgt Cashin was John's younger brother Regards , Harry