Ken, It's great to make contact and hear from you. I presume we would be 2nd cousins.
I don't have any information about Mary Ellen Buckley and the Sheehan side of the family other than what's in your message.
Abina (Albine) married Michael Kerwin in St Louis in 1919. They had three children, John (Jack), Alice, and Mary. My mother, Mary, is also still alive and living here in Oregon. Alice died in 1994 and Jack in 1997.
My biggest hole in the family history is the ancestors of our grandparents. I haven't found anything about their background in Ireland other than they came from the Millstreet (Co Cork) area.
I just talked to my mother on the phone. She would love to talk to your mother. If we can take this off the forum and in to private email I can share personal contact information. My email is genealogy at eolais dot net.