She was on to something. I've had more love and kindness shown to me from complete strangers than my entire family combined, who live to spite me. I keep telling my mom that people are generally good, it's what's got us living in the modern age, it's just that capitalism keeps the good people from sticking together.
The nuclear family is reactionary. Atomizing the family unit alienates people from the large social networks that has historically been the basis for both community and the accrual of familial wealth.
But the idea of people staying together passed the ephemeral consumerist joy of a quick fuck? No. That's as leftist as it comes.