I agree with you so much. That's an aspect that stood out in The Expanse series. Holden was from Earth and was brought up with many "fathers and mothers" I'm assuming through a time where it was difficult to have children
Looking at today it feels we'd alleviate a ton of parental pressure if we had households like that and not depend on the traditional couple.
I understand that in the novel series that sort of setup was encouraged by institutions (there is a vague mention of taxes), and in The United States this is setup is disincentivized by institutions. However if greater than two parent households was a genuinely preferable way to live I would expect more people to choose that lifestyle now.
Looking at today it feels we'd alleviate a ton of parental pressure if we had households like that and not depend on the traditional couple.