The singer's two sisters died from cancer. 

Top 8 facts about Jimmy Kimme

Carly Simon is in mourning after both of her sisters -- the Broadway composer, Lucy Simon, 

Top 8 facts about Jimmy Kimme

and former opera singer, Joanna Simon -- died this week just one day apart of each other.

Top 8 facts about Jimmy Kimme

According to multiple reports, the "You're So Vain" singer's two sisters -- whose father, Richard Simon 

Top 8 facts about Jimmy Kimme

was the publishing magnate and co-founder of publishing giant Simon & Schuster -- died from cancer. 

Top 8 facts about Jimmy Kimme

Joanna died Wednesday from thyroid cancer and Lucy on Thursday following a long battle with breast cancer. 

Top 8 facts about Jimmy Kimme

Joanna was 85 and Lucy 82, respectively. It's been reported that Joanna died in a Manhattan hospital while Lucy died at her home in Piedmont, New York. 

Top 8 facts about Jimmy Kimme

Lucy and Carly got their start in music as the folk singing duo The Simon Sisters. 

Top 8 facts about Jimmy Kimme

They would go on to release the song "Wynken, Blynken & Nod," which charted at No. 73 on the Billboard Hot 100 in 1964. 

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