Parent-youth conflict and behavioural difficulties are common issues in the field of developmental psychology. This study examines the correlations of conflict and behavioural difficulties, to see if these factors predicted a negative affect on a sample of at-risk youth. A sample of 335 at-risk youth aged 13-24 years old from Public Housing Projects in Kuala Lumpur was selected. Conflict with the father was significantly associated with negative affect. Further analysis showed that three factors were required to produce negative affect. The results support claims that father conflict, emotional problems and conduct problems are an integral part of the close relationships of at-risk youth, and discourage positive youth development among at-risk youth.