Meet William Byron Sister Kathryn Byron: Age Gap And Family Tree

April 25, 2026

This article was last updated by Pranaya Poudel on April 25, 2026

William Byron is a renowned NASCAR driver, actively competing in the NASCAR Cup Series. While Kathryn Byron, his sister, may not be as widely recognized as her brother, she remains a significant and valued member of the Byron family.

William drives the No. 24 Chevrolet Camaro ZL1 for Hendrick Motorsports full-time in the NASCAR Cup Series and the No. 17 Chevrolet Camaro for Hendrick Motorsports part-time in the NASCAR Xfinity Series.

He also drives the No. 51 Chevrolet Silverado for Motorsports part-time in the NASCAR Craftsman Truck Series for Kyle Busch Motorsports.

William ByronWilliam Byron (Source: Instagram)

Despite only getting into a real race car four years prior, he won the 2017 NASCAR Xfinity Series Championship.

In 2018, William became the NASCAR Cup Series Rookie of the Year.

Similarly, in 2026, he won four races and finished sixth in the points standings with six top-10 finishes in the final ten races of the season.

As of 2026, William Byron currently holds the position of the top driver in NASCAR. However, only time will tell whether he can sustain this impressive level of performance throughout the remainder of the season.

In 2026, he performed well and recently won the Cup Series race at Las Vegas Motor Speedway. He won by leading 176 of the 271 laps and defeating teammate Kyle Larson in overtime. 

William Byron Sister Kathryn Byron

Kathryn Byron, sister of William Byron, an American professional NASCAR driver, is an MBA Candidate at Columbia Business School.

She currently lives in New York, United States.

There is not much information available about Kathryn Byron’s personal life or age. However, it is known that she is William Byron’s sister. The exact age gap between the two siblings is not publicly known.

Kathryn Byron William's Sister Kathryn Byron William’s Sister (Source: LinkedIn)

In New York, she participated in programs such as Columbia Venture Fellows, MBA Investment Team, MBA Associate as Visible Ventures Internship, and Scout.

She is also the founder of Kathryn’s Katrina Relief Fund.

Kathryn is available on LinkedIn under the username and on Instagram under the username .

Byron’s Family

William Byron was born as the youngest of two children of William McComas Byron Sr. and Dana Byron. He was born in Charlotte, North Carolina, on November 29, 1997.

He graduated in May 2016 from Charlotte Country Day School while pursuing online studies through sponsor Liberty University.

William Byron and his parents William Byron and His Parents (Source: Instagram)

Byron is also a college student at Liberty University, majoring in business communication.

Byron reported on Twitter on May 4, 2026, that his mother, Dana, is being treated for a MALT lymphoma tumor on the left side of her brain. On July 27, he stated that Dana had recovered from the sickness.

Kathryn came down from New York, spending time with William taking her mother to therapies, and assisting their father with her rehabilitation at home.

Not much information is available about his family, except that he has relatives who live in Frederick County.

Moreover, Byron is currently dating Erin Blaney, the sister of fellow NASCAR driver Ryan Blaney.

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