This is Maslow's pyramid of needs (Credit: Doug Kenrick, Arizona State University):
The revised version also has "Immediate Physiological Needs" at the bottom but now parenting is at the top - where it belongs! This is the revised version (Credit: Doug Kenrick, Arizona State University):
When the researchers looked into what makes humans successful in surviving as a species, then mate acquisition, mate retention and parenting came in at the top. Their research paper explains why parenting is seen as more critical to evolutionary success than self-actualization.
I always felt that parenting is the most important job that any of us will ever do ... and now we have the pyramid to back up this claim!