Echoed in both their faces are their famous father's features: that aquiline nose, the long face, the high forehead.
But Julian and Sean Lennon also share something far more special — a true feeling of brotherhood, at last.
The half-brothers, aged 58 and 46 respectively, are on a road trip in California. Posting a snap on Instagram yesterday, Julian wrote: 'A lil bit wind blown and tired after a few hours driving through the mountains to the sea but so worth it. A magical day.'
It is too, for their trip along the Pacific Coast Highway is a bit of rock history and a healing moment dubbed 'life changing' by Julian.
For Julian is finally making peace with the partial estrangement from his father before his death. And it seems his friendship with Sean is going some way to provide the paternal relationship that both men have missed so deeply.
As Julian says, Sean is 'the one person I care about more than anything in the world . . . I'm here to love and support you, 'til the end of time and then some.'
It wasn't always the case. John's bitter divorce from Julian's mum Cynthia, and marriage to Sean's mother Yoko, led to strained relationships. Then, after John's murder in 1980, there were decades of mistrust — plus a dispute over John's £250 million legacy.
Yet, very quietly followed an outbreak of peace, which has matured into a close and meaningful bond.
John's bitter divorce from Julian's mum Cynthia, and marriage to Sean's mother Yoko, led to strained relationships
A mutual friend told me yesterday: 'They have been friends for about 20 years, but are growing closer as time passes.
'People talk about them as if they were enemies, and there was a lot of pain, and a lot of that was very public, but not any more.
'Yoko said to me about ten years ago: 'You know that we are a family with Julian, and sometimes families have disagreements.'
'Julian and Sean have always had a bond outside of all of that. They love each other.'
The public chapter of this brotherly reunion started on Friday, at the LA launch of the Disney+ three-part documentary, The Beatles: Get Back.
They sat next to each other at the screening and, afterwards, mingled at a party thrown by Sir Paul McCartney's daughter Stella.
Julian wrote that night: 'The One True thing I can say about it all is that it has made me feel so proud, inspired & feel more love for My/Our family than ever before. And the film has made me love our father again in a way I can't fully describe. Life changing.'
Julian, who has never married, lives in Monaco, while Sean is based in New York with his model girlfriend Kemp Muhl.
Their last public meeting came when the two men recorded a conversation together in October 2020 for the BBC, to mark what would have been John Lennon's 80th birthday. They reminisced, though some memories were maybe too raw to share.
Like how Julian taught Sean to play guitar to George Michael's Faith, and was so much Sean's 'hero' that Yoko flew 17-year-old Julian out to New York in 1980 to break the news of John's death to the then five-year-old Sean.
Lennon moved to New York with Yoko when Julian was just five years old and made a cruelly distant parent
Like how baby Julian's existence had been hidden at the behest of Beatles manager Brian Epstein.
Art student Cynthia and baby Julian, born at the start of Beatlemania in 1963, lived in obscurity as John toured the world. His secret family first came to light in 1966 when Cynthia was photographed pushing a pram. Months later, the marriage was doomed when John met Yoko Ono at an art show.
He moved to New York with Yoko when Julian was just five years old and made a cruelly distant parent. Birthday and Christmas presents were dispatched, unseen by him, from The Beatles' London office.
Julian was taunted at school for having 'walls papered with £5 notes' but, in fact, he and Cynthia had no material wealth, and he had next to no contact with John.
When he was 11, Julian was sent to New York for a few, awkward meetings — Julian estimates he saw his father ten times in all.
'I lived from birthdays to Christmas, just to be with him,' he said.
The visits themselves were filled with erratic incidents. Once, John scolded Julian, telling him not to laugh so
