Psychiatrist Colin Ross calls his model the "trauma model of mental disorders" and emphasises that, unlike biological models, this addresses the literature on comorbidity of trauma with mental disorders. Ross describes the theoretical basis of his trauma model as common sense: "The problem faced by many patients is that they did not grow up in a reasonably healthy, normal family. They grew up in an inconsistent, abusive and traumatic family. The very people to whom the child had to attach for survival were also abuse perpetrators and hurt him or her badly... The basic conflict, the deepest pain, and the deepest source of symptoms, is the fact that mom and dad's behavior hurts, did not fit together, and did not make sense."