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Sir Kevin Sinfield shares golden rule son could not break to maintain good relationship

Sir Kevin Sinfield has opened up on his special relationship with son Jack, sharing the simple rule he has always followed to ensure they stay on good terms

Sir Kevin Sinfield has one golden rule (Image: Annabel Lee-Ellis/PA Wire.)

For most of his life, Jack Sinfield has had to contend with comparisons to one of rugby league's greatest ever players. But his father, Sir Kevin Sinfield, has always been determined to make sure those expectations never spill over into their relationship away from the sport. The former Leeds Rhinos captain has opened up about the approach he adopted when his son first started playing rugby, revealing a simple agreement that has remained in place ever since.

While he briefly stepped into a coaching role during Jack's formative years, Sinfield was adamant that home should remain somewhere his son could escape the pressures of the game.

It is an arrangement that has allowed the 22-year-old to develop his own career without constantly being reminded of his father's extraordinary legacy. And following a remarkable few weeks for the family, Sinfield has explained why protecting that father-son bond has always mattered more than anything happening on the rugby pitch.

The rugby league icon experienced an unforgettable day earlier this month, completing another demanding fundraising challenge for Motor Neurone Disease before watching Jack celebrate Grand Final success with Wakefield Trinity at Old Trafford.

Sir Kevin Sinfield (Image: Getty)

It was a particularly special occasion, with Sinfield undertaking his seventh running challenge at the Manchester stadium on the very same day his son helped Wakefield produce a stunning upset to claim the Super League crown.

Yet despite the family's considerable achievements in the sport, the former Leeds star has always been conscious of giving Jack the freedom to establish himself independently rather than feel obliged to follow in his footsteps.

Appearing on The Good, The Bad and The Rugby podcast, Sinfield discussed the boundaries he introduced when briefly coaching his son, explaining why he wanted their relationship away from rugby to remain unaffected.

"I coached him for a very short space of time," he said. "He had two wonderful coaches throughout his community rugby. Unfortunately, one of them was poorly, and I jumped in to help for a little bit.

Jack Sinfield plays for Wakefield Trinity (Image: Getty)

"I suppose from growing up at home in my early 20s and understanding what my dad was like with me, home was always a sanctuary and somewhere where I got away from rugby, and I wanted it to be the same for Jack.

"Our relationship when I coached him was: when we get out the car at rugby, I'm your coach. When we get back in the car, I'm your dad, and I won't talk rugby unless you ask me. It's been the same ever since. It's been great, and we do talk rugby every now and again."

The comments offer a glimpse into the personal life of a sporting icon whose reputation extends far beyond his achievements on the field. Sinfield has become one of British sport's most respected figures through his extraordinary fundraising efforts for those affected by Motor Neurone Disease.

His challenges have been driven by the memory of close friend and former Leeds team-mate Rob Burrow, who sadly died in June 2024 after battling the condition.

Kevin was made a Knight Bachelor in the 2026 Birthday Honours (Image: Getty)

For his latest undertaking, Sinfield set off from Hull and ran between all 12 English top-flight rugby league clubs before finishing at Old Trafford ahead of the Grand Final.

The journey had been mapped out almost a year earlier, in November 2025, with the 46-year-old keen to honour Burrow by passing through the rugby league communities where his former team-mate had made his name. However, even Sinfield could not have imagined that Jack would be involved in the showpiece occasion on the evening he completed his latest challenge.

"If Carlsberg did Saturdays, we got one!" Sinfield joked. "You couldn't have written that it'd be those two teams that ended up in the final.

"You'd have gone with Wigan, Leeds. Warrington might have been in your top four or five choices. You wouldn't have picked Wakefield. Not just yet."

Gillette Tri-Nations: Great Britain v Australia
Kevin had a distinguished club and international career (Image: Getty)

'Jack has always been judged unfairly'

Jack began his professional journey at Leeds Rhinos, the club where his father cemented his status as one of the finest players in its history. Inevitably, carrying the Sinfield surname has brought its own scrutiny, with the young half-back frequently measured against his dad.

But after helping Wakefield secure a memorable Grand Final triumph, Sir Kevin hopes his son can finally move beyond those comparisons and receive recognition for his own accomplishments.

"We got to sit in the stands and watch it play out, which is pretty special," he said. "He's lived with having a famous dad, if you like, all this time, and he doesn't know any different. However, he's always been judged by that, unfairly.

"Now, he's on his own path because he's won his own Grand Final and the monkey's off his back, and hopefully the reference to me is now gone, and he can just go and do what he needs to do, which is lovely."

Jack is looking to follow in his father's footsteps (Image: Getty)

The pair also managed to share a special moment shortly before kick-off, when they bumped into each other inside Old Trafford as Sir Kevin prepared to carry the Grand Final trophy onto the field.

With the occasion drawing closer, the former Leeds captain was able to catch up with his son after his pre-match preparations, providing another memorable moment amid an extraordinary day for the family.

"I spoke to him on the day, I got to see him," Sinfield recalled. "We were waiting in the tunnel right at the top just before we brought the trophy on, and he'd just finished warm-up and came up, and I spoke to him, which was lovely."

It was a small but significant reminder of what has always been central to their relationship. For all his experience, accolades and knowledge of the game, Sinfield has never wanted to become an overbearing presence in his son's career. His priority has simply been to give Jack the space to make his own way in rugby while ensuring that, away from the pitch, he will always have a father rather than a coach.