Father-daughter incest is more traumatic than any other type of child-sexual molestation. This study examines some of the factors which may lead to father-daughter incest. The author divided 40 Caucasian couples into three groups: (1) clinical incest group; (2) clinical non-incest group (to control for clinical status); and (3) non-clinical group. Each couple answered a series of self-reporting questionnaires along with other information forms. The researcher examined 12 variables and correlated the results between the three test groups using a variety of statistical measures. When compared to the non-clinical groups, the clinical incest and clinical non-incest groups exhibited higher cross-generational triads, more father-child estrangements, more expressions of family conflict, and higher parent-child autonomy. Family members appeared distant and disconnected from one another and, as is typical in these kinds of families, children often moved inappropriately into an adult role by default, resulting in the children parenting themselves and their own parent(s). The researcher did not find any significant differences between the clinical-incest group and the clinical non-incest group. One possible explanation for this lack of significant differences could be that the 2 groups resemble each other on the 12 variables tested. (RJM)