How do bilingual brothers and sisters talk to each other? Sibling language use is an uncharted area in studies of bilingualism. From a perspective of independent researcher and parent of three bilingual children Suzanne Barron-Hauwaert discusses the issues of a growing bilingual or multilingual family. What happens when there are two or more children at different stages of language development? Do all the siblings speak the same languages? Which language(s) do the siblings prefer to speak together? Could one child refuse to speak one language while another child is fluently bilingual? How do the factors of birth order, personality or family size interact in language production? With data from over 100 international families this book investigates the reality of family life with two or more children and languages.