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.