Firstborn achieve more than other siblings, is it possible

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I want intelligence, IQ, financial resources provided by parents and its effect on firstborn because after the born of other siblings it will be divided between all of them, quality time sent with parents be related ,and additional related perspectives to this topic are welcomed. All perspectives discussed in the research are to be supported by sources. The research conclusion should be agreeing with argument that firstborn achieve more than other siblings.
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