Carly Simon grieving after sisters die one day apart

Carly Simon lost both her sisters to cancer this week.

The 78-year-old singer is grieving after Broadway composer Lucy Simon died following a battle with breast cancer.

In the early 1960s, Lucy and Carly formed their own folk singing duo called The Simon Sisters.

both went on to have solo careers, Lucy later enjoyed success as composer of the Broadway musical 'The Secret Garden' in 1991.

Before her illness progressed, she had been working on 'On Cedar Street', a musical adaptation of the 2015 novel 'Our Souls At Night'.

She went on to work as the arts correspondent for PBS’s 'MacNeil-Lehrer News Hour' until 1992, and later worked in real estate.