Carly Simon loses both of her sisters to cancer on the same day.

Singer Carly Simon (center) lost her sisters Lucy (left) and Joanna to cancer this week.

Ron Galella Collection via Getty Ron Galella Collection via Getty

Singer Carly Simon’s two older sisters died this week after losing their battles with cancer.

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Joanna Simon died on Wednesday after a battle with thyroid cancer

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one day before her 86th birthday.

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Her sister Lucy, 82, died on Thursday of breast cancer.

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The three sisters, along with their late younger brother Peter, who died from cardiac arrest while battling cancer

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Richard Simon was the co-founder of the publishing house Simon and Schuster.

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Joanna Simon passed away on Wednesday after a battle with thyroid cancer.

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Joanna Simon, a regular performer at Carnegie Hall,

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