Dual language acquisition; Bimodal language acquisition; Spracherwerb (biling.) ; Language acquisition (biling.) ; Bilingual language acquisition ; Sprachenwahl; Language choice; Diglossia ; Gastarbeiterkinder; Migrant workers (children of) ; Auswanderer (Kinder) ; Emigrants' children; Migrantenkinder; Aussiedler (Kinder) ; Kinder mit Migrationshintergrund; Immigrants'/Emigrants' children ; Bilingual education ; English (American) ; USA (English language in the) ; USA (engl. Sprache in den) ; English in the USA; Englisch in den USA; American English ; Chicano; Puertoricans; USA (span. Sprache in den) ; Mexican American Spanish; USA (Spanish language in the) ; Spanglish; Inglañol; Tex-Mex; Spanish in the USA