His older brother might be on track to become the world’s first trillionaire, but the youngest of the Bezos siblings certainly has plenty to boast about at the family dinner table, too. So what is Mark’s background and why has his billionaire brother chosen him as his wingman for his landmark journey into space? From his history of heroism to their shared sense of humour (and fashion), this is what we know about the other Bezos brother. The capsule’s six observation windows will be the largest ever used in space and Mark has called it a “remarkable opportunity” in an announcement video alongside his brother. The launch will be Blue Origin’s first human spaceflight and is set to take place in a rocket-and-capsule combo designed to autonomously fly six passengers more than 62 miles above Earth - high enough to experience several minutes of weightlessness and observe the curvature of the planet before returning.

Today’s mission is likely to be his biggest act yet. The 53-year-old father of four is also a successful businessman, marathon-runner and volunteer firefighter who has spoken in the past of wanting to make a difference in the world through small acts of kindness and generosity. But Mark’s recruitment for the mission is unlikely to solely come down to their shared history and sense of humour.

The billionaire tech mogul has long spoken of his close relationship with his youngest sibling (they also have a middle sister called Christina and Jeff once called Mark the “funniest guy in life”). The greatest adventure, with my best friend.” “On July 20th, I will take that journey with my brother. “Ever since I was five years old, I’ve dreamed of traveling to space,” Jeff, 57, wrote in an Instagram post to his 2.9 million followers yesterday. Jeff Bezos is set to make his first trip into space, along with another balding space enthusiast named Bezos: Jeff’s younger (taller) brother Mark, five years his junior, who will be accompanying him on the mission.

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