Demonspell by Phoebe Matthews
Along with a big house and income, Elaine inherits five immortal relatives who need constant attention. Try keeping a husband with that set of in-laws. Yes, she has tried. Twice. And failed. Now, just when she meets a new guy, a band of demons demands that Elaine and her family leave Seattle immediately, alive or dead.
Demonspell is the first book of the Sunspinners series.