John Lennon's son Julian reveals the sweet way he keeps in touch with Paul McCartney

Right from his birth in 1963, John Lennon's son Julian Lennon always looked to Paul McCartney as a father figure.

And, understandably, the 59-year-old grew even closer to "Uncle Paul" following his dad's tragic murder in 1980.

So it will come as no surprise they're still in touch ... and they have a very sweet way of maintaining contact.

Speaking to Rock and Roll Garage, he revealed: "Paul and I do keep in touch. We send each other cards for Christmas and birthdays.

"But it's difficult, he is touring all over the world like the Energizer bunny he doesn't stop."

Now a musician, too, he added: "That's someone to definitely look up to in regards to longevity in a career."

Despite having McCartney as a father figure growing up, Julian admitted he still remembers "simple" moments with John, however, "sadly too few."

"I just remember sitting on a roof with him before mum and dad separated, looking at the sun going down … it's simple moments like that. Sadly too few," he recalled.

On the evening of 8 December 1980, John was shot and fatally wounded in the archway of the Dakota, his residence in New York City.