New court documents say Prince had no will.
The musician "died intestate" - meaning he did not specify what should happen to his estate, his sister, Tyka Nelson claims.
In a court document, she says her brother has "substantial assets," but did not list them. Recent estimates have valued his estate at $300 million.
Nelson listed herself, three half-brothers and two half-sisters as heirs.
She asked the court to name a special administrator to oversee her brother's assets.
Meanwhile, reports surfaced claiming the celebrity's half-siblings had worried in the past about his alleged abuse of cocaine and the painkiller Percocet.
Lorna and Duane Nelson have since died, but their attorney, Michael Padden, spoke to the Minneapolis Star-Tribune about his client's alleged concerns.
“Both were really concerned it would end his life prematurely,” he told the newspaper.