I think it is fairly accurate. Intellectually and family-wise I am definitely upper middle class, but the kind who didn't get anything for free.
My family was even poor when I was little, but we've always had a big house and *a lot* of books and deep discussions.
For being swedes, my family is incredibly cultured, educated and a bit refined/conservative socially and taste-wise.
To be honest, we've all held blue-collar or low paid healthcare jobs, but we're all highly educated or going there.
There's also a strong politically active streak.
What's also funny, in a family of six, we are predominantly NT/NF.
My dad and my brother both tests as ENFJ but they more resemble ENTPs. Me, ENFJ. If they are ENFJs too, it
would explain why Christmas is so intense, at times...
Mother INFJ, little sister INTJ, i'm unsure about my big sister. She's not the intellectual type, she's more like an ISFJ stereotype with an ENTJ stubbornness and spiked club.

Perhaps ESTJ. But it's hard to know, sometimes she could even be an INFP, because she's really emotional in the Fi-way. She's bipolar. No idea who she got it from.
Anyway, it's an entertaining family.