Bobbie Nelson, the older sister of country music legend Willie Nelson, has died

She was 91 years old when she died

The cause of death was not immediately clear

Posted on the Facebook page on March 10, Nelson's family revealed that Bobby had "passed away this morning, peaceful and surrounded by family."

Bobbie Abbott was born on January 1, 1931 in Texas

She was the original member of the Willie Nelson and Family Band as a pianist and singer

Bobby had three sons to raise on her own after the death of her husband

Bobbie released her debut album "Audiobiography" in 2007

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