Dayton and Darrell are nontwin siblings raised together. Statistically speaking, their intelligence levels would be MORE correlated than:

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Nontwin siblings raised together, like Dayton and Darrell, would have a lower correlation in intelligence levels compared to identical twins (whether raised together or apart) due to the identical twins sharing more genetic material. However, their intelligence levels would be more correlated than nontwin siblings raised apart, like Kaley and Epstein, because the shared environment contributes to the similarity in intelligence among siblings raised together.

Dayton and Darrell Are Nontwin Siblings Raised Together