Although not studied by the generative approach (Shlonsky 2017), the embedded Wh- in situ clause nevertheless belongs to the French language spoken in a large amount of areas, and, we believe, to “français tout court” (Blanche-Benveniste & Jeanjean 1987): until now, it has mainly been studied in Quebec (Lefebvre & Maisonneuve 1982; Blondeau & Ledegen 2021) and in Reunion Island (Ledegen 2007a, 2007b, 2007c, 2016; Ledegen & Martin 2020), but it has recently been massively attested in the Multicultural Paris French project in the suburbs of Paris (Gardner-Chloros & Secova 2018) and Strasbourg (Marchessou 2018). These new data could be read as a language contact, as a recent linguistic change, or as a long-established “popular” structure (Guiraud 1966), different analytical hypotheses that will be detailed in this study. These recent data also argue in favour of the methodology of ecological corpora, obtained within the framework of a strong acquaintanceship and located at the pole of communicative proximity (Koch & Oesterreicher 2001). The examination of various existing corpora will reveal the structural functioning of the structure and contrast the corpora following the modes of interaction, the oral or written medium, as well as on the chronological axis.