It has been known for many years that children are damaged psychologically when there is a high level of antagonism between their parents. Litigators, judges and proffered experts working with these high-conflict families—in a child abuse investigation and/or child custody dispute—need to be aware of this damage and also how it and its causes are properly identified, diagnosed, and treated. This chapter explains four patterns of maladaptive family relationships that are driven by high levels of parental conflict: (1) parents who engage in frequent arguing (the child may manifest anxiety, depression, and behavior problems); (2) parents who engage in physical violence (the child may manifest serious behavior problems and posttraumatic stress disorder); (3) when both parents seek the affection and companionship of the child (the child experiences loyalty conflict); and (4) when one parent strongly undermines the child’s relationship with the second parent (the child experiences parental alienation). Particular topics include: