This isn't meant to diminish the difficulties of people who need to look after their children. But I work in a laboratory where the senior people blithely complain about how hard it is to manage shared child-raring duties in a well-equipped home office, while junior employees are more or less expected to magically have a productive home office in a shared flats, often in less-than-ideal environment (e.g. with noisy room-mates or building sites next door), with RSI staring us down.
Definitely? I have no kids and live with and fully support my father who had a brain tumor the size of a walnut in his head a couple years ago. Just because someone doesn't have kids doesn't mean they don't have responsibilities (goodness so many negatives in one sentence!).