This article discusses the friction between religious adherents with various dimensions of interest that are hegemonic. After reviewing various literature related to radicalism and intolerance, we find that radicalism leads to thinking level of radical competence and radicalism which leads to actions level and situations (radical performance) can encourage the emergence of various complex problems, one of intolerant conflict due to fanaticism so that it is easy to blame the others, exclusivity which tends to discriminate or separate and tend to be revolutionary by using violence to achieve their desires. Therefore, this article aims to explain the urgency of family's role in internalizing the values of tolerance in millennial generations, because the younger generation is experiencing cognitive opening that a micro-sociological process that brings them closer to acceptance new ideas of more radical. The family environment has a considerable influence on formation of a child's personality to a young age even when the child leaves family environment. Some of our recommendations to prevent and reduce radicalism and intolerance also as an effort to promote a culture of peace include; internalize the value of tolerance in family environment by building cooperation with the big community as well as with schools and religious organizations, as well as providing full protection supported by media literacy for millennial generations.