That's a pretty good example of that, yeah. It's also interesting to note how values, or at least the potential for them, may be conserved across long-term shifts: American culture is notably fixated on geneaology compared to societies where the extended family is a socioeconomic norm; the motivation to have a wider familial context is there, even in families and individuals who are quite comfy with the nuclear pattern. I'm not suggesting it's a causal influence that trumps the economics driving the push for extended families, but I can't help seeing it as influential. The demographic transition and decline of extended families in the US wasn't that long ago...
If it's worth saying, but not worth its own post, even in Discussion, it goes here.