E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Brother Sam.
The brother of Lord Dundreary (q.v.), the hero of a comedy based on a German drama, by John Oxenford, with additions and alterations by E. A. Sothern and T. B. Buckstone. (Supplied by T. B. Buckstone, Esq.)