I looked at his again and noticed that our accounts often disagree. The spirit is compatible but the details differ. It seems to me this culture has evolved an extremely naive view of how memory works. Good evidence is the credulity with which we greet the hundreds of thousands of allegations of Satanic abuse, though there's never been a body found out of the allegedly thousands of babies killed. It's a view of memory as a static thing, a tape that gets filed away that will be exactly the same when you pull it out.
Imagination is part of it too.
We really have to be a lot more realistic about the limits of memory. So the discrepancies between your memoirs and your brother's are part of the truth. We have been accustomed to talking about computers using the human mind as metaphor, trying to make the computer like the mind but better, faster. Computers are incapable of imagination and intuition. We are incapable of the kind of recall the computer has.