I'm not surprised. Dad was good at hiding things like that. I'm sure she knows that you had nothing to do with it, obviously, but, love my sister to death, she can be thick headed sometimes. Hopefully, with some time, she'll adjust.
There really weren't many. I can help you with some of that, if you want. I'm not a Watcher, but I read almost all of the books in Giles's library over the years. Plus, kind of grew up around it.
You should come by the bar where I work, Death and Taxes. I think you'd enjoy it.