This is not just about one parent or this is not just about one person, this is basically just a symbol of what you face when you make money.
If you are not super rich or wealthy, it is always hard to deal with life when you are not alone and have responsibility of other people. Think of a person who has to work and earn enough money to support their spouse and their kid, isn't that similar? And this is a lot more common as well, maybe a kid taking care of their parent is not common but a person taking care of his own family every day is very very common and it is the back bone of our world.
When we are talking about a single guy living at home, we are talking about someone who can save some money with even small amount income, when we talk about a family dad, we are talking about someone who can't live with 2x more income. Sometimes you need income of 3 people just as a single person.
This is actually a pretty good analogue, I’d say it’s extremely common to the point people have take it for grant and they don’t even know they have did something that’s totally questionable from the very beginning, since the media has brainwash the entire society to the point that they will treat people at certain gender certain colour with certain responsibilities and vice versa, say men are breadwinner, woman are child keepers, white are tech savvy black are sport savvy, yellow are sweat shop savvy, this is thing that has become common and take it for grant don’t even question whether who start this belief at the first place and is it sustainable in the long run, but in the long run we often see the thing start to break apart then we begin to panic and wonder what’s going wrong didn’t your teacher your mum and your dad told you it’s supposed to be in this way but it’s all a lie now??