He was born in 1924, a member of the Cahill family. He married Beatrice Cahill, but was branded an Outcast and thrown out of the Cahill family by Beatrice's sister, Grace, for embezzling funds from the Cahill treasury. Stephano and Beatrice divorced in 1961, and he died later that year.
- Beatrice Cahill- ex-wife
- Grace Cahill- sister-in-law
- Fiske Cahill- brother-in-law
He appears on the Top Secret section of Card 434: The Nobody, on the Trent family tree.
- Putting up with Beatrice