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You need to find a genome change if it exists which requires whole genome sequencing. so its a money question and doesn't guarantee a result

And even if a genome change exists, it may not show up in the offspring depending on which version of gamete they're derived from.

With identical twins, the genome is identical since both twins derive from the same fertilized egg.

I'm not sure how future advancements can overcome that issue.

There can be very small mutation which you might be able to find if it happened.