I was able to find very general info about the older brothers on MyLife, but you have to pay to get the rest. In each one, there are links to Ron and Anna.
Shane:
https://www.mylife.com/shane-baggs/e30343263816 (I don't understand what his occupation is. "Ninja at Novelis" sounds like some made-up anime shit that someone on DeviantArt would invent.)
Jeremy:
https://www.mylife.com/jeremy-baggs/e30369006606
There's a little part of me that wonders if Amanda's claim of Shane sexually abusing her are really true. I tend to believe that they are because if you look at her blogging history, that's one of the only stories from her past that remains consistent throughout the whole charade. Almost any other detail or story she told about her childhood would change according to whatever topic she wanted to talk about in her blog post that day. I never realized until I looked back at her posts since she died how many times she would hint at sexual abuse.
The post about her father's work in the computer industry reminded me of an old post from her Ballastexistenz blog (which of course I can't find now!) where she discusses how sometimes parents overprotect their autistic kids. What struck me was when she mentioned her family's home computer which had internet (uncommon for most families in the early to mid-90s, but makes sense given her dad's work). She said something about using a bulletin board system (BBS) and that she would often receive inappropriate messages from many "sexual predators", but the gist was that by being given unfettered access to such inappropriate things, she learned how to handle herself.
While this was an example of a post where she did kind of have a valid point about how parents of disabled children can sometimes go overboard with trying to ensure their safety, it just seems kind of unnerving to me that she immediately brought up her encounter with internet predators to illustrate her point. Seriously, I think she said this within the first paragraph of the post! And her tone came across as "Meh, nothing came of it" as if it was almost normal.
I'm more interested in Jeremy than Shane since he apparently never bought into any of this. We only have Amanda's former classmate/Jeremy's then-girlfriend's word, but I trust that a lot more than Amanda's ever-changing word.