The increasing prevalence of sin in partys is one of the major social problems in Muslim societies today. This problem is especially true for religious people when they encounter sin at the family party. Because kinship is so high in Iranian-Islamic culture, leaving the party is not easily possible and sometimes even leads to cut off relations. On the other hand, staying in the place of sin also has unfortunate consequences. In such a situation, the religious person as a moral agent faces a great challenge between maintaining kinship and leaving the place of sin. The present study seeks to provide a solution to get out of this moral challenge by analytical method. The results show that although both sides of the challenge have strong scientific and religious arguments, they are inefficient because they do not consider all aspects and general judgments. The proposed solution is to analyze the situation and detail the rule.