Question: Callum Smith, is a British professional boxer, who competes in the super-middleweight division, and held the European, the British, and the WBC Silver titles between 2015 and 2017, he's the youngest of the Smith brothers, Stephen Francis Smith, is a British professional boxer, born on which date?
Sentence (from "Callum Smith"): He is the youngest of the Smith brothers—Paul, Stephen, and Liam—all of whom are professional boxers.
Relevant evidence: Yes