HPDH: Chapter 35 - King's Cross - Dumbledore's personal story (spoiler)

In Chapter 35, Dumbledore tells Harry about his sister, relationship with Grindelwald, and his fear of his own power & losing control. How believable was this to you? Do you think this was consistent with Dumbledore?

i believe so. mainly because he had always believed in the greater good, when it came down to it, he treasured his family and resented the fact that from such a young age, he did not have a normal family. even though everything else in his life was so perfect. this perhaps comes down to the fact that he was more immature (more than 100 years ago!) and was able to learn from his mistake or letting power get to his head.
i think the greatest thing we learnt was that dumbeldore was able to acknowledge mistakes, and even knowing that some how things would work themselves out.