Two of the 11 close-relative pairings were identified as pairs of monozygotic twins — identical twins, who arose from the division of a single fertilized egg and who therefore share essentially all of their genetic material.

Finding two pairs of identical twins in a single archaeological context, among a group of 64 individuals, is statistically extraordinary.

The stable isotope analysis found that related children tended to have similar dietary profiles, consistent with their having been raised in the same household environments — members of the same family groups rather than distant genetic relatives with no shared upbringing.

Radiocarbon dating showed that the chultún was used over centuries, not in a single mass event, indicating that the ritual practice it represents was sustained across multiple generations.