I wonder how often in "normal" companies (not FAANG), workloads shift to non-parents due to typical inability of management to alter timelines along with the re

I wonder how often in "normal" companies (not FAANG), workloads shift to non-parents due to typical inability of management to alter timelines along with the realities of a situation? For example, if parents are given a bit of slack or simply have more sick days due to real life responsibilities, but project plans are not altered accordingly, are those without children feeling the pressure to compensate? I have a suspicion this is a problem in companies where investors have expectations of quarterly growth, returns or exit plans, and not much of an outlook to create a healthy long term business. Disclosure: Am manager, not parent.