Communication Accommodation Theory (CAT) predicts that people adjust their language to match that of the other to promote comprehension, coordinate action, and facilitate harmonious relationships. CAT predicts that mothers will adjust their sentence length and complexity to match those of children. Prior tests of CAT confounded trait-like language…

Children learning two languages (Dual Language Learners; DLLs) represent a rapidly growing population in the United States. DLLs are disproportionately more likely to live in families of low socioeconomic status (SES), which places many of them at risk for poor dual-language outcomes. To date, most studies on SES and dual language development have…