Slay / Laurell K. Hamilton.

My name is Anita Blake and my family think I'm marrying a demon straight out of hell. If they'd ever met a real demon, they'd understand the difference. Considering my dark and dangerous past, I never expected preparations for my wedding to Jean-Claude to go smoothly. We've already faced naysayers and a power-hungry ancient evil and come out the other side still standing. But now I need to do the one thing that actually scares me - introduce my very religious, very human relatives to my fiancé, the newly crowned vampire king of America. As I try to keep the peace between the family I left behind and the family I've chosen, dark forces jump at the chance to take advantage of the chaos. With our happy-ever-after and everyone's immortal souls hanging in the balance, it's time to face a hard truth. Blood makes you related, but only loyalty makes you family.