No, it’s not necessary to speak X at home if you live in an X speaking country, and it may even be harmful: often children will not pick up language Y if only o

No, it’s not necessary to speak X at home if you live in an X speaking country, and it may even be harmful: often children will not pick up language Y if only one parent speaks it and the other parent speaks X. Bilingual children whose parents don’t speak the language of the community at home may learn languages slightly slower but they quickly catch up once they make friends who only speak X.