Into This World by Chad Farmer (Emerge #13)

Warren, after being estranged from his evil and sadistic cult mother Rune (who believes in aliens) and a brainwashed sister, attempts to lead a normal life with his wife and soon-to-be-born son.

However, things don't go as planned when Alamathea kidnaps the newborn baby. Warren is forced to once again face the family he once fled from. Rune has otherworldly plans for her grandson which involve an "elite extra-terrestrial" race. Now Warren must fight for his and his son's life against and an unknown and terrifying agenda.