I'm corresponding with my brother, I have three older ones and this is the middle one, six years older than I am. My sister-in-law, our oldest brother's wife just sent pictures she took with her phone camera of the house we "grew up in", back in the middle nineteen-fifties.
My brothers aren't great friends with one another as adults, since they're older than I am and I was the only girl, I had my own room while they all were housed together and I don't know their relationship status, all that happened when they were growing up. So, I forwarded the pictures to the middle brother, my "nicest" brother, he's always been softer, kind, and thoughtful unlike my other two brothers and myself

Even though he was the middle brother, so always chasing after the oldest, he didn't have the oldest's problems; the oldest and I, the youngest sibling, have a lot in common so get along while the other two "middle" siblings use to get along (our youngest brother doesn't have anything to do with any of us anymore, is out of communication and lives in Hawaii).
So, my middle brother and I are just idly emailing about the house and our childhoods and he starts telling me stories of his relationship with our father and they paint my father in a less than shining light

and, as the "precious, darling, baby girl" that is different from my remembrances of him. So, I now suddenly have a few negative stories I'm ruminating on and trying to integrate. I'm glad of the growing, adult, relationship with this brother but. . .
What do you do with sudden new background knowledge?