Children’s social withdrawal behavior is affected by parents’ nurturance, psycho affection, family environment, and other factors. Nowadays, many young couples choose to live with their parents so as to take care of new- born children. When the husbands have to live with their mother-in-law, there comes a word “uxorilocal family” . In this kind of family, family relations are more complicated than nuclear families. In order to investigate the effect of father-son relationship to children’s social withdrawal behaviors in such families, we use Parent rating scales for the child behavior check list CBCL to evaluate the 101 children’s social withdrawal behavior. Unlike the former investigations, in order to obtain more real data, we utilize two modes of instruments to evaluate the relationship of father-son, one is HOME scale, the other is the projective test. Since the 1960’s, The Family Relations Indicator(F.R.I.) described by John G. Howells and John R. Lickorish is the picture projective technique for investigating family relationships. Based upon introduction of the revised and enlarged edition of the F.R.I., the description and construction, administration and scoring, sample response to the pictures, the advantages and disadvantages, the other purpose of this research is to explain and discuss the suitableness and revision of F.R.I. so as to enable it to apply in the prospect of the Chinese family therapy. Furthermore, we evaluate the reliability and validity of F.R.I. of the relationship on father-son. The findings show that the relationship between fathers and children obtained from FRI is in good validity and reliability. Father-son Relationship correlate with children’s social withdrawal behaviors significantly, especially in uxorilocal marriage families. Conclusions: In uxorilocal marriage families, the uxorilocal marriage effect both the father-son relationship and children’s social withdrawal behaviors significantly, father-son relationship plays medium adjusting role to children’s social withdrawal behaviors.