Leviathan Rising (The Children And The Gods Book 4) by Angel van Atta
This book follows Emma's family as they settle into life in their new home next to the infamous Moraley House. When an ancient entity emerges from a deep passage to another universe, Emma and two of the Moraley children must band together to save baby Levi and themselves from its dark magic.
Little does anyone know that something even more sinister has also crawled out of the same passage and Amanda is forced to fight for her sanity as the remaining Moraley children and Ellis try to pick up the pieces left in the wake of the malevolent entity's rampage through her mind.
Meanwhile, Jess must confront her own cruel monster: her mother-in-law. Along with Sarah and Ben, she prepares for a Thanksgiving family feast, but as tensions rise, they soon realize that this holiday may not be one they all survive.