Undead And Unworthy. Number 7 in series

Having recently lost her dad and stepmother, Betsy Sinclair (née Taylor) is adjusting to rather more than just married life. Their untimely deaths have left her and Eric as sole guardians of her little brother, Jon. Two vampire parents - albeit vampire royalty - for a decidedly human baby. Still, Betsy is more than up for the challenge. If only everyone would stop being so nervous around her, given her sudden recent burst of power.
Betsy most emphatically Does Not Want To Discuss It, and for the moment, everyone is following her lead. But then the ghost of Betsy's stepmother turns up at their house. And as stubborn and insufferable as she was in life, she's even more annoying in death - especially as she regards her demise as all Betsy's fault!