nuclear family
A household consisting of parents and their children, as opposed to an extended family. Common in sociological and everyday contexts.
現代の日本では核家族が増えている。
Nuclear families are increasing in modern Japan.
As the trend toward nuclear families advances, opportunities to live with grandparents decrease.
Along with urbanization, the shift toward nuclear families has been progressing.
They live as a nuclear family.
In recent years, the number of nuclear families has been increasing.