The Forms and Functions of Aggression Questionnaire is widely used to measure the aggressive behavior in the peer context by many researchers. This scale was developed by Little, Jones, Henrich, and Hawley in 2003. It consists of four principle dimensions of aggressive behavior: overt and relational aggression, instrumental and reactive aggression. The objectives of this study were (i) to evaluate the revised and translated version of this scale by CFA, (ii) to know the reliability of the model, and (iii) to prove the validity of the model. The Chinese version appears to be a valid and reliable instrument for the assessment of relational aggression against sibling. The resulting model will help future researchers, especially related to aggression in the sibling context.