My Kid Brother's Band a.k.a. The Beatles! by Louise Harrison
In case anyone doesn't know, this is the book that George's sister wrote. It's an insider's view, needless to say. We think of, for example, the significance of the Ed Sullivan show. Her account of that was especially interesting. George was quite ill at the time. She was the one behind the scenes taking care of him. It's a wonder he was even able to perform. But he did. They made it fine as the whole world was able to see. But George needed some extra help from his sister at that time.
BTW, I hope this hasn't been discussed already. I'm relatively new to this thread.
I remember reading where Louise recalled: A doctor was called in for George because he had a very high fever. When I told the doctor I was George's sister he said "good. I want you to take care of him because right about now you're the only sane woman in all of New York city!"