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You can compare the DNA between yourself and your older sibling. Siblings have APPROXIMATELY (as in, on average) 50% the same genes, because each gene has a random chance of being inherited from the mother or father.

If you are related (brother, half-brother, cousin, etc) then the DNA similarities will be obvious. If you are not, well, that also will be obvious.

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Q: How can you tell if you have an older sibling who was adopted when you were a baby if your parents deny it?
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If your parents miscarry before you does the baby count as your older sibling?

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