It is believed that multilingual speakers outnumber those that are monolingual in the world’s population, which renders the research into different aspects of multilingualism particularly worthwhile. The present paper wishes to address the topic of raising multilingual children in relation to their order of birth into the family. Parents, being crucial agents of primary socialization, play undoubtedly a decisive role in organizing the early multilingual development of their offspring and the variables of family size (two children or more) and birth order of the children seem to be of great importance. The most important differences, facilitating elements, difficulties and challenges, voiced by parents of multilingual toddlers and teenagers, including changes in parental attitude, implementation of new strategies, factor of experience and accumulated resources, position and function of the first-born, and others, were illustrated and discussed. The findings of the study may be of theoretical interest to linguists, and of practical interest to parents showing curiosity or concern about growing multilingual family.