Every long established functional family that I am aware of, where the couple remained married, the grown up children love and respect their parents, and so on and so forth, is quietly and furtively eighteenth century. Dad is the boss. When the kids were kids, Dad was the head of the family. The family was one person, and that person was Dad. Mum picked up the socks.
So, eighteenth century did it right, and it has all been social decay since Queen Victoria was crowned.
Show me a family where husband and wife fairly share the task of picking up the socks, and I will show you a family where dad sleeps on the couch and Mum's lovers visit every week or so to use the main bed.
It is just not in women's nature to have sex with their equals, so the egalitarian family just does not function. Legal measures to make it egalitarian invariably backfire and fail to have the desired effect. Maybe after some millenia of evolution, women will evolve the capability to have sex with their equals, but right now, does not work.