“…Definitions and descriptions of heritage speakers (HSs) vary (cf. Benmamoun, Montrul & Polinsky, 2013;Fishman, 2001;Flores, Kupisch & Rinke, 2017;Kupisch & Rothman, 2018;Montrul, 2008Montrul, , 2016Polinsky, 2018;Polinsky & Scontras, 2020;Rothman, 2009). For the purpose of the present paper, the details of who exactly counts as an HS or not is less crucial, because we expect similar processes to obtain in situations of EXTREME LANGUAGE CONTACT.…”