Lennons together

What could be worse than one of John Lennon's kids touring Europe? How about the pair of them touring together? Apparently, Julian Lennon has joined Sean on his bus:

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."

We notice that slightly barbed "none of my friends will get on the bus...", but we're surprised that this sort of thing is encouraged. The British Royal Family wouldn't let two male heirs travel together in case something terrible happened and they were both wiped out at the same time. Surely not a risk anyone would want to take with these two...