Undead And Unreturnable - Davidson, MaryJanice

Though she's the vampire queen, Betsy Taylor is much more like a princess. But with a half-sister who's the devil's daughter, an evil stepmother, a fiend living in her basement, assorted spirits and killers running amok, and a wedding to plan with the former bane of her existence, Eric Sinclair, Betsy is not sure she'll survive the holidays.