Mark Harmon, renowned for his iconic role as Leroy Jethro Gibbs on NCIS, has quietly added a new title to his repertoire: grandfather. Fans of the hit CBS drama were delighted to learn that Harmon’s son, Sean Harmon, and his wife, Courtney Prather, welcomed their first child, Cooper Knox, earlier this year. This heartwarming family update has brought joy to fans and provided a rare glimpse into the personal life of the beloved actor.
This article delves into the details of Mark Harmon’s new role as a grandfather, exploring the announcement made by Courtney Prather and the reactions from fans. We’ll also touch on Sean Harmon’s involvement in the NCIS universe and the couple’s journey to parenthood. Join us as we celebrate this special moment for the Harmon family.
Mark Harmon Becomes a Grandfather: A Quiet Celebration
Mark Harmon, the face of NCIS for 19 seasons, has always maintained a relatively private personal life. Therefore, it came as a pleasant surprise to many fans when news broke that he had become a grandfather. The announcement was made not by Mark himself, but by his daughter-in-law, Courtney Prather, who shared the news on her Instagram account.
Courtney’s heartfelt post revealed that she and Sean Harmon welcomed their son, Cooper Knox, on May 22, 2025. The post included adorable photos of the newborn, giving fans a glimpse into the newest addition to the Harmon family. The news quickly spread throughout the NCIS fandom, with fans expressing their excitement and well-wishes for the family.
This new chapter in Mark Harmon’s life adds another layer to his already impressive career. While he is known for his on-screen roles, his role as a grandfather is sure to be one of the most rewarding yet.
Courtney Prather’s Heartfelt Announcement
Courtney Prather’s Instagram post was a touching tribute to her newborn son. In her July 4th announcement, she wrote, “1 month with you 💙. Cooper Knox Harmon ~ 5.22.25.” The simplicity and sincerity of the message resonated with fans, who flooded the comments section with congratulatory messages.
The photos shared by Courtney offered a rare look into the family’s life. The images captured the joy and love that Cooper Knox has brought into their lives. Fans appreciated the intimate glimpse into the Harmon family’s world, as they celebrated this special moment with them.
Courtney’s announcement not only revealed the birth of Cooper Knox but also highlighted the strong bond within the Harmon family. Her decision to share this personal news with the world was a testament to the love and support that surrounds them.
Fans React to the News: An Outpouring of Love
As soon as the news of Mark Harmon becoming a grandfather spread, fans of NCIS took to social media to express their joy and excitement. Courtney Prather’s Instagram post was flooded with comments from fans congratulating the family and sending their best wishes.
Many fans expressed their desire to see a photo of Mark Harmon with his grandson, Cooper Knox. Comments such as “We need a photo of Cooper and grampa Mark” were common, highlighting the fans’ eagerness to see the beloved actor in his new role as a grandfather.
The outpouring of love and support from fans underscored the impact that Mark Harmon has had on their lives. His portrayal of Leroy Jethro Gibbs has made him a beloved figure, and fans were genuinely happy to celebrate this personal milestone with him.
Sean Harmon’s Connection to the NCIS Universe
Sean Harmon, Mark Harmon’s son, has also made his mark in the entertainment industry, particularly within the NCIS universe. He has portrayed a younger version of Leroy Jethro Gibbs in several episodes of the original series, earning praise for his portrayal of the iconic character.
In addition to his on-screen appearances, Sean Harmon also serves as an executive producer for the NCIS: Origins spinoff, which premiered in October 2024. This involvement highlights his deep connection to the franchise and his commitment to continuing his father’s legacy.
Sean’s success in the entertainment industry is a testament to his talent and dedication. His role in the NCIS universe has allowed him to connect with fans and showcase his abilities, while also honoring his father’s contributions to the show.
Sean and Courtney: A Journey to Parenthood
Sean Harmon and Courtney Prather’s journey to parenthood has been a beautiful one to witness. The couple tied the knot in August 2021 after five years of dating. Their wedding was a private affair, attended by close friends and family.
Just over a year later, in November 2022, the couple announced that they were expecting their first child. The news was met with excitement and anticipation from fans and loved ones. The birth of Cooper Knox in May 2025 marked the next chapter in their lives, as they embraced the joys and challenges of parenthood.
Sean and Courtney’s relationship is a testament to their love and commitment to each other. Their journey to parenthood has been filled with joy and anticipation, and the arrival of Cooper Knox has only strengthened their bond.
A New Chapter for the Harmon Family
The news of Mark Harmon becoming a grandfather has brought joy to fans around the world. The arrival of Cooper Knox marks a new chapter for the Harmon family, filled with love, laughter, and cherished moments. As Mark Harmon embraces his role as a grandfather, fans can’t help but feel a sense of warmth and happiness for the beloved actor.
While Mark Harmon has not yet publicly commented on becoming a grandfather, the outpouring of love and support from fans speaks volumes about his impact on their lives. His portrayal of Leroy Jethro Gibbs has made him a household name, and fans are eager to celebrate this personal milestone with him.
As the Harmon family embarks on this new adventure, we send them our best wishes and look forward to seeing more heartwarming updates in the future. The legacy of Mark Harmon continues, both on and off the screen, as he embraces his new role as a grandfather.
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