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FILE - Tyka Nelson, sister of the late musician Prince, appears in front of his costumes at the "My Name is Prince" exhibition at the O2 Arena in London, on Oct. 26, 2017. Nelson, Prince’s only full sibling, died Monday. She was 64. Her son President Nelson says she died at a hospital in Robbinsdale, Minnesota. A cause of death was not immediately available. (AP Photo/Frank Augstein, File)

FILE - Tyka Nelson, sister of the late musician Prince, appears in front of his costumes at the "My Name is Prince" exhibition at the O2 Arena in London, on Oct. 26, 2017. Nelson, Prince’s only full sibling, died Monday. She was 64. Her son President Nelson says she died at a hospital in Robbinsdale, Minnesota. A cause of death was not immediately available. (AP Photo/Frank Augstein, File)

FLE - Tyka Nelson, sister of the late musician Prince, appears at the American Music Awards on Nov. 20, 2016, in Los Angeles. Nelson, Prince’s only full sibling, died Monday. She was 64. Her son President Nelson says she died at a hospital in Robbinsdale, Minnesota. A cause of death was not immediately available. (Photo by Jordan Strauss/Invision/AP, File)

FLE - Tyka Nelson, sister of the late musician Prince, appears at the American Music Awards on Nov. 20, 2016, in Los Angeles. Nelson, Prince’s only full sibling, died Monday. She was 64. Her son President Nelson says she died at a hospital in Robbinsdale, Minnesota. A cause of death was not immediately available. (Photo by Jordan Strauss/Invision/AP, File)

FILE - Tyka Nelson, sister of the late musician Prince, appears in front of his costumes at the "My Name is Prince" exhibition at the O2 Arena in London, on Oct. 26, 2017. Nelson, Prince’s only full sibling, died Monday. She was 64. Her son President Nelson says she died at a hospital in Robbinsdale, Minnesota. A cause of death was not immediately available. (AP Photo/Frank Augstein, File)

FILE - Tyka Nelson, sister of the late musician Prince, appears in front of his costumes at the "My Name is Prince" exhibition at the O2 Arena in London, on Oct. 26, 2017. Nelson, Prince’s only full sibling, died Monday. She was 64. Her son President Nelson says she died at a hospital in Robbinsdale, Minnesota. A cause of death was not immediately available. (AP Photo/Frank Augstein, File)