Surely you don't think daughters are more reproductively successful than sons on average?
Surely I do - it is common knowledge today that about 40% of men and 80% of women managed to reproduce?
Every child has both a mother and a father, and there are about as many men as women, so the mean number of children is about the same for males as for females. But there are more childless men than childless women, because polygyny is more common than polyandry, ultimately because of Bateman's principle.
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