More than 95% of deaf children are born to hearing parents. For these children to learn sign language, places where deaf children meet, such as schools for the deaf and special schools, play an important role. Conversely, these places are also important from the point of view of language inheritance. In the case of immigrant children, it is not uncommon for them to have difficulties in using their parents’ language as they acquire the language of the society in which they live. Both cases show the difficulty of language inheritance by social minorities.