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It's the age-old family debate - who is the smarter sibling?

The first-born child is likely to be smarter than their siblings, according to a major study.

Researchers from the Universities of Edinburgh and Sydney found that first-borns achieved higher IQ scores than others, after testing 5 000 children.

It's believed parents pay more attention and support to their first child, especially with teaching reading, writing, and problem-solving ability.

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