“…The recommended students and one of their parents received a small compensation gift after completing the online student and parental questionnaires, in either Cantonese or English versions, via “google form.” The student questionnaires were designed based on the Bilingual Language Profile (BLP, Birdsong et al, 2012 ), a widely used tool for assessing speakers’ bilingualism (e.g., Amengual, 2016 ; Renwick and Nadeu, 2019 ; Aldrich, 2020 ). The degree of bilingualism was examined along four modules separately for L1 and L2, including “language history,” “language use,” “language proficiency,” and “language attitudes.” Similarly, the parental questionnaires also consisted of four modules, including “language history for parents,” “language education history for children,” “language proficiency for parents,” and “Urdu proficiency for children.” Also, their Chinese teachers were invited to assess their students’ proficiency in Cantonese.…”