Carly Simon’s Sisters, Composer Lucy Simon and Opera Singer Joanna Simon, Dead of Cancer a Day Apart

NEW YORK CITY – JUNE 1: Musician Carly Simon and sisters Lucy Simon and Joanna Simon attend The National Academy of Popular Music’s 25th Annual Songwriters Hall of Fame Induction Ceremony on June 1, 1994 at Sheraton New York Hotel and Towers in New York City, New York. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)

Ron Galella, Ltd./Ron Galella Collection/Getty

Carly Simon is mourning the death of both her sisters, who died of cancer one day apart from each other.

Lucy Simon, a Tony Award-nominated Broadway composer, died of metastatic breast cancer Thursday at the age of

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