Carly Simon is upset after her sisters passed just one day apart.

The 78-year-old singer is in mourning after Broadway composer Lucy Simon died of breast cancer just one day after former opera singer Joanna Simon died of thyroid cancer.

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Lucy was 82 years old, while Joanna was 85.

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Carly, Lucy, and Joanna were born in New York to parents Richard L. Simon, founder of the Simon Schuster publishing company.

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Their mother Andrea was a civil rights activist and singer.

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Lucy and Carly formed their own singing duo, the Simon sisters, in the early 1960s.

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While they both pursued solo careers, Lucy found success as a composer.

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Joanna made her New York City Opera debut as Mozart's Cherubino in 1962.

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Lucy and Joanna's brother, photographer Peter Simon, died of cardiac arrest in 2018 at the age of 71 after being treated for cancer.

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