Cook’s daughter, Marsha Gerber, said the twins were born prematurely and weren’t expected to make it. Instead, they lived 83 years together.

Cook died of a heart attack and Mitchel died from Alzheimer’s complications.

The family believes that the close timing of their deaths is not a coincidence. Gerber told KHOU that, "Helen met Clara in heaven."

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Fans celebrate in the stands after Cape Verde defeated Eswatini in a World Cup qualifying soccer match at Estádio Nacional in Praia, Cape Verde, Monday, Oct. 13, 2025, to clinch their qualification for the 2026 World Cup. (Cristiano Barbosa/AP)

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