In my experience the resentful childless women just started using “family” as the same excuse the mothers used - but applied it to their parents (also covered under most family leave laws/policies).
I’m a parent who has had to work regardless of what’s going on at home; that isn’t the employer’s problem. Fortunately I deal with older staff (all with grown children); unfortunately they’ll retire soon...
It is the employees problem for sure which is why there will be multiple lawsuits and the childless will win. You can not show favoritism in the office. Maybe in the 70’s you could but not today.