Right, my post was complaining about how few children people are having. For the sake of contrast, I supposed an idealized situation where our fertility rates are comfortably above mere replacement, say 3 to 4 per woman. In such case, a woman with 4 children, each having 4 children, each having 4 children, will indeed have >100 descendants.
> The way forward is not to lean on women to do huge amounts of uncompensated labour, the return of which flows to someone else.
Over the past 10,000 years, we've determined a set of social constructs that solve this problem really well in the context of agrarian society: marriage (monogamous, enduring partnership between provider and carer), and religion (commitment to a purpose higher than yourself, because a world of individuals pursuing their own interests can only fail).
Anyway, note my quotes on "equality": try as we might, women are not men, and nobody wins by getting women to be more like men. The ideal of equality is like communism: inspiring, misleading, and impossible. No one is equal, nor should they be.