The two sons of late BEATLE John Lennon are spending as much time as possible together - to get to properly know each other after living apart their whole lives. Half brothers JULIAN LENNON, 43, and Sean Lennon, 31 - both musicians - have different mothers and have rarely seen each other over the years. But now Julian has joined Sean on his tour bus as it travels across Europe. Sean says, "How sweet is that? I am totally thrilled and deeply touched by this. "It's really fun having him on the bus. It's nice to have some quality time with him. None of my friends are willing to rough it on the tour bus, so I am very impressed."