Justin Mayweather Jones isn’t a name many boxing fans will be familiar with.But the undefeated super lightweight is the half-brother of one of the sport’s greatest fighters, Floyd Mayweather Jr.Instagram - Justin MayweatherJustin is the son of Mayweather Sr[/caption]The pair share the same father, Floyd Mayweather Sr, with their four sisters: Nalai, Fatimah, Detricia, and Fannie.However, unlike his siblings, Jones didn’t meet any of the family on his dad’s side until he was 19.Recalling the moment he found out who his relatives were during an interview with The Mayweather Channel, Jones said: “When I was 15-16, my older sister told me they were my family.“But I didn’t find out until we got a DNA test when I was 19.“The only reason she told me was because I was bigging him up so much [Mayweather Jr]…“She was like, ‘Why are you talking about your brother like that?’“I was like ‘What the f*** are you talking about? I am totally confused. Because I already had two brothers on my mum’s side.”After reuniting with his father, Jones turned his hand to the family business.His brother Floyd Jr is undoubtedly the most successful boxer from the Mayweather stock, boasting an unblemished 50-0 pro record and world titles in five separate weight classes.But before him, there was his father, Floyd Sr, and uncles Jeff and Roger.Instagram - Justin MayweatherHe compiled a 7-0 record before mysteriously parking his career in 2022[/caption]He is the younger half-brother of Mayweather JrGettyRoger won major world titles at super featherweight and lightweight, while Jeff held the lesser IBO strap.Floyd Sr didn’t scoop any belts during his pro career, but he did take Sugar Ray Leonard nine and a half rounds before succumbing to a stoppage loss.When Jones eventually took to the sport, he did so like a duck to water, winning his first seven pro bouts.He spent the majority of his career training out of the Mayweather gym under his father’s watchful eye.But despite the heavy investment, Jones hasn’t boxed since 2022, and at 38 years old, it seems unlikely he ever will again.Of his seven opponents, only one had a winning record, while most of his fights took place at Mexican club shows. It remains a mystery as to why someone with Jones’ genetics didn’t push on further with his boxing career, and with no explanation available on the internet, it will remain so.