George and Josh started cycling together in 2021, raising money for charity.
Later that year they cycled from Land’s End, Cornwall, to John O’ Groats in Scotland.
In 2022 they cycled 3,728 miles [6,000km] across the USA in just three months.
On their latest adventure, the pair spent 400 days away from home, travelling around the world, including across Europe and Asia.
Josh, a content creator and filmmaker, said it would be “quite the shock” to go back to everyday life, adding: “It feels surreal.
“It’s hard to put into words right now [the] full spectrum of emotions happening.
“Our bodies have adapted to cycling every day — I feel as fit as ever.”
Josh said they had been “welcomed with open arms” in every country, adding the strengthened relationship with his father was the biggest highlight.
“There’s been tough times and we have both been on our knees at times for a variety of different reasons.
“Obviously dad and I have had a few arguments, but it has been an amazing time and we’ve learnt so much about each other and have built this incredibly strong relationship that I could not be more grateful for.
“I am so, so grateful for dad to be able to take the time off work to be able to do this with me.”