It's In The Blood (Book 3). It's In The Blood, #3

The Thirst Within: BetrayalBook Three of the "It's In The Blood" SeriesThe greatest threat doesn't come from the shadows outside. but from the family within. The DeClue family thought the nightmares were finally under control. They were wrong. A new darkness has entered their household in the form of Angel, a teenage cousin under a lifelong curse that leaves him trapped in the body of a ten-year-old.
While he appears innocent, Angel carries generational secrets that could destroy everyone he touches. As twin babies Macaulay and Dawndee arrive, bringing a flickering light of joy to Malachi and Ronnie, an ancient evil is stirring with renewed purpose. Miguel Sanchez, the monstrous ancestor executed in the 1800s for his horrific crimes, has found a way to reach beyond the grave. He is no longer content to haunt their dreams; he is reaching into the waking world, and his newest pawn is closer than anyone suspects.
When a family friend is found dead under mysterious circumstances, Malachi, Ronnie, and Eddie must confront an impossible question: Is there a traitor in their midst?Amidst the growing paranoia, young Tommy Russle discovers the family's dark secret and chooses to embrace it, forging a bond with Lucifer that will alter both their destinies forever. But as tragedy strikes and violent outbursts escalate, the family is forced to make an unthinkable choice-one that will echo through eternity.
In a world where every vampire's death leaves a final, lethal "Death Wish, " the price of betrayal may be more than any of them can pay.