First language, also known as mother tongue, is
generally the language a person learns first. However,
one can have two or more native languages thus
being a native bilingual or indeed multilingual. The
order in which these languages are learned is not
necessarily the order of proficiency. Incomplete first
language skills often make learning other languages
difficult. Often a child learns the basics of his or her
first language or languages from his or her family.
The term mother tongue, however, should not be
interpreted to mean that it is the language of one's
mother. For instance, in some paternal societies, the
wife moves in with the husband and thus may have a
different first language or dialect than the local
language of the husband. Yet their children usually
only speak their local language.