Your essay needs more depth. Some of your points are manifestly wrong. Many people in the world still raise very large families with seven or more children. It is no longer the norm in the West, not because people have realized that one cannot raise more than two children (in fact, some people had damn well better, if mankind is not to go extinct) but because women are increasingly choosing to favor career over family. It will, one suspects, be a short-lived trend, as evolutionary theory tells us all such trends must be.
The social effects on people living their own life that they don't take care of their parent, they start thinking for their own family and avoiding their parents. They start sending their parent to old age homes and not even calling them over there.
This is at least an answer to the prompt, but it consists of a series of assumptions with no logic or examples included to back them. You need to explain why we should believe these things are true, and why, if they are, they are tied to people generally living on their own.