That is exactly what is going on in our household. We got hit with job loss/major health problems in a matter of 2 months. We subsequently lost our home. We are in recovery stage, but it’s been at a snails pace. My 23 yr old son has worked since he graduated high school, but hasn’t moved out because we are pooling our resources. He could live on his own, but right now we can’t quite make it without him because we have 2 more still in school, and we all are living better together than we would be apart. He’s a great young man, nothing immature about him, I think he’s very generous and caring to stick around. And he loves his younger brother and sister, and wants to help them and us.
The more kids you have the more likely it is that some are going to strike out on their own to alleviate the burden on their parents or they stay and contribute to the household.
Another point if I might. As so many single women are raising kids, it seems to me that there would be some what less desire to kick the kids out of the nest. When that happens then mom is alone. Most people don't like to be alone.