 Both the PTSD sufferer's symptoms and the family members' failure to be sufficiently supportive can contribute to the estrangement.Studies on soldiers with PTSD have concluded that families with a PTSD patient require more support to facilitate healing and prevent estrangement.Personality disorders, particularly the cluster B personality disorders (antisocial personality disorder, borderline personality disorder, histrionic personality disorder, and narcissistic personality disorder), cause significant interpersonal conflicts.