The Secret Siblings: 5 Things You Didn't Know About Floyd Mayweather's Brothers And Sisters

Floyd "Money" Mayweather Jr. is globally recognized as one of boxing's most dominant and highest-paid athletes, but the true extent of his family's lineage, particularly his siblings, remains a mystery to many. As of December 2025, new and unique details about the extended Mayweather family continue to surface, revealing a complex web of relationships and boxing ambition that stretches far beyond the celebrated uncles, Roger and Jeff, and his father, Floyd Sr.

The Mayweather name is synonymous with an unparalleled boxing dynasty, yet the focus has overwhelmingly been on the relationship between Floyd Jr. and his father/trainer. Digging deeper reveals at least two confirmed siblings who share the same father, Floyd Sr., including a half-brother who is also a professional boxer and a new baby sister whose birth created a massive 40-year age gap within the family. These lesser-known family members are critical to understanding the full scope of the Mayweather legacy.

Floyd Mayweather Jr. Full Biography and Profile

Floyd Joy Mayweather Jr., a name that commands attention in the sports world, built his empire on an unparalleled 50-0 professional boxing record. His life and career are deeply intertwined with his family's boxing roots, which began long before his rise to fame.

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• Full Name: Floyd Joy Mayweather Jr. (né Sinclair)
• Date of Birth: February 24, 1977
• Place of Birth: Grand Rapids, Michigan, USA
• Parents: Floyd Mayweather Sr. (Father) and Deborah Sinclair (Mother)
• Professional Record: 50 wins, 0 losses (50-0)
• Boxing Career Span: 1996–2017 (Competed)
• Major Achievements: Undefeated World Champion, winner of fifteen major world titles, and the lineal champion in four weight classes.
• Current Role: Boxing promoter and entrepreneur.
• Children: He is the father of five children: Koraun, Iyanna "Yaya", Zion, Jirah, and Devion Mayweather.

The Lesser-Known Mayweather Siblings: Justin and the 40-Year Gap Sister

While the world knows the boxing trio of Floyd Jr., his father Floyd Sr., and his uncles Roger and Jeff, the list of Floyd Jr.'s direct brothers and sisters is shorter and far more obscure. The most recent and surprising revelations involve a half-brother who is following the family trade and a baby sister born decades after the boxing icon.

Justin Mayweather Jones: The Half-Brother Boxer

Perhaps the most significant sibling outside of the immediate spotlight is Justin Mayweather Jones, Floyd Jr.'s half-brother. Justin's connection to the family was not always public knowledge, with one source mentioning a DNA test that revealed the family secret.

Justin's life story is notably different from the privileged upbringing Floyd Jr. enjoyed once his career took off. Reports indicate Justin endured a difficult upbringing before his relationship with the Mayweather family became known.

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Like his famous relatives, Justin chose to enter the ring. He is a professional boxer who competes in the Light middleweight division. His professional career began in 2013, and he has maintained an undefeated record.

• Name: Justin Mayweather Jones (also known as Justin Allen Jones)
• Relationship: Half-brother (shares the same father, Floyd Mayweather Sr.)
• Date of Birth: April 21, 1987
• Boxing Division: Light middleweight
• Professional Record: 7 wins, 0 losses (7-0).
• Current Status: His boxing career was reported to be "parked" at 7-0, suggesting a pause or a less active schedule compared to the family's main fighters.

The New Baby Sister: A 40-Year Age Gap

In a surprising and very recent development, Floyd Mayweather Sr. reportedly fathered a child, giving Floyd Jr. a new half-sister. The most notable detail of this birth is the massive age difference between the siblings.

The new baby sister was born approximately 40 years after Floyd Jr.'s birth in 1977. This revelation highlights the fact that Floyd Sr. has a large and extended family, with reports suggesting he has at least five other children besides his famous son.

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The name and specific details of the baby sister are kept private, but her existence adds a new chapter to the complex Mayweather family tree and provides a unique example of the family's generational span. This massive age gap is a testament to the longevity of Floyd Sr.'s life and his extended family commitments.

The Original Mayweather Brothers: Roger, Jeff, and the Boxing Dynasty

To discuss Floyd Mayweather Jr.'s siblings without mentioning his uncles is to miss the central pillar of the family's boxing legacy. Floyd Jr. was raised in a household steeped in the sport, with his father and two uncles—the original "Mayweather Brothers"—all achieving success as professional boxers and, crucially, as elite trainers.

These three men—Floyd Sr., Roger, and Jeff—are the sons of Theartha and Bernice Mayweather and are the ones who instilled the defensive mastery and technical prowess that defined Floyd Jr.'s career. They are not his brothers, but his father and uncles, forming a generational boxing trio.

Roger Mayweather (1961–2020)

Roger Mayweather, often referred to as the "Black Mamba," was perhaps the most influential figure in Floyd Jr.'s corner. He was a two-weight world champion, holding the WBA super featherweight title and the WBC light welterweight title.

After his fighting career, Roger became a legendary trainer, famously guiding Floyd Jr. through the majority of his professional career and teaching him the defensive "shoulder roll" technique that made him virtually untouchable. Roger's passing in March 2020 was a significant loss to the family and the boxing world.

Jeff Mayweather

Jeff Mayweather, the youngest of the three brothers, is a former IBO super featherweight champion. He is known for his quieter demeanor but has maintained a significant presence in the boxing world as a respected trainer and analyst.

Jeff, alongside his brothers, is a crucial part of the Mayweather family's generational edge in boxing mastery. His insights and training contributions continue the family's deep-rooted connection to the sport.

Floyd Mayweather Sr.

Floyd Mayweather Sr. is the patriarch and the father of the subject of this article. A former welterweight contender, he is renowned for his defensive skills and his role as a highly respected boxing trainer. His tumultuous but ultimately successful relationship with his son, Floyd Jr., is one of boxing's most famous stories.

The Complexities of the Mayweather Family Tree

The Mayweather family is a true boxing dynasty, but its branches extend further and wider than most fans realize. The revelation of half-siblings like Justin Mayweather Jones and the new baby sister confirms that the family's story is still being written. The consistent theme throughout the generations, from Floyd Sr. and his brothers to Justin and Floyd Jr., is the inescapable pull of the boxing ring.

The extended family members, especially those who choose to pursue boxing, face the immense pressure of living up to the "Money" legacy. Justin's undefeated record, though "parked," shows the inherent talent that flows through the Mayweather bloodline. The sheer size and generational span of the family, exemplified by the 40-year age gap between the famous champion and his youngest sister, ensure the Mayweather name will remain a fascinating and complex entity in sports history for decades to come.