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Pro Bowl Player
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Couldn’t one also argue the reverse? That since the gay uncle doesn’t have kids there’s less of a support network. I’ve helped my cousins in the past and they’ve also helped me.
That's certainly true in today's world, but keep in mind that the last century has seen tremendous changes in childhood mortality rates. Before that (and especially in the deep history of our species), it was not uncommon for entire generations of families to fail to reach adulthood due to disease, starvation, lack of shelter. And there were no states to provide services to children and families. Meanwhile, even the life of the average adult and thus the length of a generation was fairly brief.
An extra adult to hunt, gather, farm, and build could do more to help a given cohort of a family's children to survive instead simply providing another 6-8 fragile offspring who they would have to care for themselves.
Good to think on, thanks for the interesting question.