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 "Stephen Smith (boxer)"): He is the current WBC Silver super featherweight champion and a former British featherweight and British super featherweight champion, he is also a former Commonwealth featherweight champion.
Relevant evidence: No