This study explores the extent to which bilingual speakers in stable bilingual communities become fully bilingual in their two community languages. Growing evidence shows that in bilingual communities in which one language is very dominant, acquisition of the dominant language may be quite unproblematic across sub-groups, while acquisition of the minority language can be hampered under conditions of reduced input. In Wales, children are exposed to both English and Welsh from an early age, either in the home or at school, or both. The data reported here indicate that regardless of home language background, speakers develop equivalent, mature command of English, but that command of Welsh is directly correlated with the level of input in Welsh in the home and at school. Furthermore, maintenance of Welsh in adulthood may be contingent on continued exposure to the language. The data have implications for theories of bilingual acquisition in stable versus immigrant bilingual communities, for optimal conditions for bringing up bilingual children, and for theories of critical periods of acquisition.

This study explores the extent to which a bilingual advantage can be observed for three tasks in an established population of fully fluent bilinguals from childhood through adulthood. Welsh-English simultaneous and early sequential bilinguals, as well as English monolinguals, aged 3 years through older adults, were tested on three sets of cognitive and executive function tasks. Bilinguals were Welsh-dominant, balanced, or English-dominant, with only Welsh, Welsh and English, or only English at home. Card sorting, Simon, and a metalinguistic judgment task (650, 557, and 354 participants, respectively) reveal little support for a bilingual advantage, either in relation to control or globally. Primarily there is no difference in performance across groups, but there is occasionally better performance by monolinguals or persons dominant in the language being tested, and in one case-in one condition and in one age group-lower performance by the monolinguals. The lack of evidence for a bilingual advantage in these simultaneous and early sequential bilinguals suggests the need for much closer scrutiny of what type of bilingual might demonstrate the reported effects, under what conditions, and why.

This study explored the effects of quantity and quality of input on bilingual children's acquisition of complex plural morphology in Welsh. Study 1 explored the quality of adult input and revealed target-like marking of plural forms in naturalistic adult speech. Study 2 presented eighty-eight 7–11-year-old children, across three bilingual language groups (L1 Welsh, 2L1, and L2 Welsh), with a plural production task. Results revealed performances approaching L1 adult norms among L1 Welsh-speaking bilinguals, but delayed progression among 2L1 and L2 Welsh bilinguals, although analyses of errors revealed various levels of structural knowledge. Forms requiring the addition of a plural suffix were less difficult to acquire than those involving alterations to the root, with each type acquired with greater levels of accuracy with increasing levels of exposure to the language. The implications of these findings for our understanding of bilingual acquisition of complex structures under minority language conditions are discussed.

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