You said you knew a lot about Patrick Shhehan, and that they came from
Hyde Park, unless i mis read your message.
I don't know if theres any connection, or even if they are still in
Hyde Park but I worked with a lady years ago (she'd be about 60ish today I think) who lived in
Hyde Park, and I think her husbands name was
Sheehan,. But its a very common name in these parts, so I'm just tossing this out.
If you think it could be them, one suggestion, since I'm not in touch with this women since we both retired, is to get your hands on a phone directory(and check it out.
Good
Luck again
Barbara