The linguistic diversity enduring beyond institutional pressures and social prejudices against non-standard dialects questions the social forces influencing language maintenance across generations and how children contribute to this process. Children encounter multi-dialectal interactions in their early environment, and increasing evidence shows that the acquisition of sociolinguistic variation is not a side issue but an inherent part of the general acquisition process. Despite these recent advances in sociolinguistic acquisition, children's sociolinguistic uses remain under-studied in relation to peer social networks and the ability to use dialect for identity purposes. Our study focused on a grammatical sociolinguistic variable consisting of the alternation between a regional and a standard variant of the third person object pronoun in French. The regional variant is a remnant of the Francoprovençal language and its usage by adults is strongly associated with local identity in the French Alps. We described, using questionnaires, the social networks of 117 10–11 year-old girls and boys living in the same restricted rural area. Thirteen native target children (7 girls and 6 boys) were selected from the sample, as well as 39 same-sex friends chosen according to their place of birth (native vs. non-native) and the duration of their friendship with the targets (number of years they have known each other). The target children were recorded during spontaneous dyadic conversations during free play at school with each category of friends. Target boys, but not girls, used the regional variant significantly more frequently with their long-term native friends than with their non-native friends. This adjustment mirrored their partners' uses. Moreover, with long-term native friends, boys used the regional variant twice as frequently as girls. Boys appeared thus as key actors in the maintenance and the diffusion of regional cues in local social networks.

Although stylistic variation within social networks has been described in adults, this topic remains under-researched in children. One question that remains unanswered is the extent to which stylistic variation is the result of automatic alignment or of intentional, pragmatically motivated adjustment. We present an in-depth sociolinguistic case study of a 10-year-old boy, his family and four friends selected according to their place of birth and the duration of their relationship with the boy. Statistical analyses of sociolinguistic variables of French suggest that the child's use of these variants is influenced by pragmatic motivations but not by automatic alignment. La variation stylistique est bien décrite chez l'adulte. Toutefois, sa forme, ses mécanismes et ses fonctions ontogénétiques doiventêtre davantageétudiés chez l'enfant. Une question concerne notamment le degré auquel cette variation résulte d'un alignement automatique sur les usages de l'interlocuteur ou d'un ajustement intentionnel, fondé sur des motivations pragmatiques. Nous présentons uneétude de cas approfondie d'un garçon de dix ans enregistré avec sa famille et quatre amis sélectionnés selon leur lieu de naissance et la durée de la relation amicale qui les lieà l'enfant cible. L'analyse statistique de variables sociolinguistiques du français suggère que cet enfant est capable d'ajustements subtils en fonction de l'identité des interlocuteurs. Plutôt que d'être sous-tendus par un alignement mimétique sur les usages d'autrui, ces ajustements semblent fondés sur des motivations pragmatiques et identitaires.

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