Searching for Thomas Purcell, Son of Pierce Purcell

I am trying to trace my Father's Stepbrother, Thomas Purcell. All I know is that he was the son of Pierce Purcell, Auctioneer, ? - 1912 of Dublin. Thomas was apparently in the British Army during WWI and migrated to the USA approx 1919-1920, where it is believed he became a butler in a prominent Household.

Any information would be gratefully received.
thank you
Patrick Purcell
Melbourne Australia