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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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools