Conversation so far:
What are the names of the Smother's brothers?
Thomas and Richard Smothers
Where were Thomas and Richard Smothers born?
The brothers Thomas and Richard Smothers were both born on Governors Island in New York Harbor
Who was the Smothers brother's father?
Thomas B. Smothers, Jr.
Did the Smothers Brother's go to school?
They graduated from Redondo Union High School in Redondo Beach, California, and attended San Jose State University

Question: When did they get into show business?
Self-contained rewrite: When did the Smothers Brothers get into show business?