Conversation so far:
Where was Ben Carson born?
Carson was born in Detroit, Michigan.
Does Ben Carson have siblings?
Ben Carson has an older brother, Curtis.
Where did Ben Carson attend school?
Ben Carson graduated with a B.A. in psychology from Yale and with an M.D from the University of Michigan Medical School.
Who are Ben Carson's parents?
Ben Carson was born to Robert Solomon Carson, Jr. (1914–1992), a World War II U.S. Army veteran, and his wife, Sonya Carson (née Copeland; 1928–2017).
Who is Ben Carson's mother?
Ben Carson's mother was Sonya Carson (née Copeland; 1928-2017).
What did Ben Carson's mother Sonya Carson do for a living?
Ben Carson's mother, Sonya Carson, worked two to three jobs at a time in order to support her sons.

Question: What did his father do for a living?
Self-contained rewrite: What did Ben Carson's father, Robert Carson, do for a living?