This Thomas Dunne...wasn't he Father Dunne? There used to be a Father Dunn's home for boys in the St. Louis area.
I don't know much more about this, because he was from an older generation.
I am descended from Hannah Hennessy Dunne, married to T.E. Dunne, related or not, I do not know.
She died in the late late 1800s, St. Louis, MO