Yikes, I didn't see the second page of this thread.
So there is discrepancy on Linda Sullivan's death certificate about the informant "miss Anna Sullivan" and her 1937 address and wouldn't she be going by her married name?
Regarding the ancestors of Bridget/Linda, the 1937 death certificate shows her father was John Boland, making her maiden name Boland; her mother was Sarah Duffy. Both of these parents born in Ireland.
Parker