There are several short stories that have been published separate from the books that explain a few things. I've read 3 of them:
Warning :: Spoiler Ahead! Highlight to read message!
- When Sookie first meets Cataliades and the Queen; they show up at her house with the vamp who killed Hadley and offer to let her kill him since she's the next of kin.
- Back story on Claudine and Claude, and their triplet, Claudette. Sookie solves the mystery of who murdered...