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 "Luke Campbell (boxer)"): He held the WBC Silver and Commonwealth lightweight titles from 2016 to 2017, and has challenged once for the WBA and "Ring" magazine lightweight titles in 2017.
Relevant evidence: No