Nature often produces more offspring than will survive in a predator/prey environment. People in third world countries have large families as a needed work force and insurance against death of some of them. But even there the birthrate slows as the population becomes more urban, which doesn't help much as those countries resources continue to be spread pretty thin regardless.
In order to have reproducing great grandchildren one must start reproducing at a pretty young age. That's counter to everything we know about marriage, childbirth, education, and success. On the other hand everyone is someone's grandchild or great grandchild whether that antecedent is living or dead.
We have other needs that should come first.
You can check how many kids the great grandparent had even after that great grandparent is dead.
In a nation as rich as ours we do NOT have other needs that prevent us from educating all our kids. We perhaps have some inappropriate priorities.
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