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Full siblings (full brothers or full sisters; or brother and sister) have the same biological parents and are 50% related (full siblings share 50% of their genes out of those that vary among humans). Identical twins by definition are 100% related.
The egg then divides into two embryos, creating identical twins who share the same genes as one another. Since monozygotic twins come from the same fertilized egg, they have the exact same DNA. Identical twins are always the same sex and blood type. Identical twins do not run in families, contrary to popular myth. Source: NHS.