@fiedler, some people do spend all their time on webdip... But i'm missing the essence of your question.
Investing time and energy in a family is an evolutionary imperative, but the values we use to do so differ based on culture. Some cultures have extended families with multiple partners, others exclude men from outside the family (so only sons and nephews live with the family, the father of a child will not live with his child and insteas lives with his mother's family), the idea of a 'nuclear family' is very new, and has inly really existed since it has been feasible to produce enough products and houses to keep every member of the middle class (who are likewise relative new).
So in historic terms, before we had machines to do most of the domestic work, the wealthy keep servants to do it for them, and lived however they liked, and the poor just about survived. The middle class is a bit older than machines...
Before we had a middle class, everyone was either a serf/slave working in agriculture or a large land owner living off the labour of their serfs. Two groups with very different values. And yes, they would invest time and energy in their families, but each group also had very different resources to do so.
Before we had agriculture, everyone's job was hunting and gathering (or nomadic living following a herd of semi-domesticated animals) and social groups had completely different values. In Irish myth the people who stole away cattle from the neighbouring valley were considered heroes. So there was no concrete idea of ownership/property rights. It was a world where might made right, or at least the ability to take and keep cattle was all the was needed to prove the rightness.
I can't really speak to how their family values were, because we have very little to go on. But our cultural values vary wildely, with both tradition (varying from place to place) and technology (varying over time).
In short, i think it exists in our memes, not our genes.