Many heritage speakers, starting particularly from the second generation, return to the practice of their heritage languages so as to build or rebuild their diasporic and heritage identities. Within an urban context such as in Montreal (Quebec), multilingual behaviour exists. This is due to the presence of multiple languages and dialects, as well as the bilingual reality of this city, where both French and English are dominant. Such conditions provide evidence of how determinant in-group ideologies and stereotypical attitudes are concerned with communities and languages (standard and vernacular) and how they function in the process of linguistic integration within the group and the Canadian city. Focusing on recent research that compares heritage speakers of Portuguese and Italian origin in Montreal, this contribution addresses whether identifying places have an important role in the process of integration within the group, in shared spaces of language or dialect practice, both private and public. Moreover, questions arise as to how standard languages are valued within both communities (mainly in schools) and how competency and legitimacy have been evaluated and by whom, in this process of integration. The two communities observed are very different, given the practice and behaviour as well as in-group ideologies of inclusion. This contribution argues that, as a consequence of our ‘global’ societies, there is an extension of new identities during the process of development where multilingual behaviour is reviewed and analysed for the dynamicity in the repertories of new generation speakers. Our comparison brings to light a central ideology of language purism, and the ways in which it is institutionalized and/or contested across the two groups.