noun
small family; nuclear family
Refers to a small family unit, typically a nuclear family, as opposed to an extended family. Often used in sociological or demographic contexts.
現代の日本では、小家族が増えている。
In modern Japan, small families are increasing.
核家族 specifically means 'nuclear family' (parents and children), while 小家族 is a broader term for a small family unit.
Compound of 小 (small) and 家族 (family). The term is a straightforward combination of its components.