‘==**Functional fit theory**==’ family adapts to the functions it needs to perform in society
→ In modern industrial family, nuclear family meets needs so is dominant
→ Previously, extended family fit needs better
→ Industrial society requires a ==**geographically + socially mobile workforce**==
* Status is now ==**achieved**== rather than ==**ascribed**==, and this can cause conflict in the extended family as a son may become higher status than his father in work
* Easier for nuclear family to move than the extended
* Results in the ==**mobile nuclear family**==; structurally isolated from extended kin; may keep in touch but no obligation to