The Oldest Child Is Smarter and Here's Why
First Born Children Are Smarter Than Their Siblings
New study says the oldest child is smarter than their siblings.
Why Older Siblings are Smarter???
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Older children pass along intelligence to siblings
Why Older Siblings are more Intelligent [Hindi, Urdu]_HD
First-born children are smarter than younger siblings
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Why Older Siblings Are Better At Life
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My sister is something else 😂
First-Born Children Are Smarter Than Their Siblings A Study Says
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