” I’ve seen surveys indicating parents with more children were generally happier than parents with less children.”
What does more and less mean numerically? 1 vs. 2, 2 vs. 4, 5 vs. 10 ?
Also, we may have correlation, but what is causation? In other words, do more children bring happiness or do happier people have more children?
I tend to believe both sides are true and they help each other.