I read with interest your posting concerning Elizabeth Mayhew/Mailloux and her second husband, David Henry Long.
I have been working on the Long family history for some time now. David Henry Long is a branch of my family.
My information about his family is rather sparse. Until I read your posting, I didn't realize that he had a daughter, Beatrice Long.
By any chance, would you have a photograph of David & Elizabeth Long and daughter Beatrice???
Are you a descendant of this line?
Looking forward to hearing back from you.