A tempest is brewing in the Prince estate over the proposed appointment of a "personal representative" to help manage the late musician's vast financial interests pending their distribution to his heirs.

The issue is scheduled for a hearing at 9:30 a.m. Thursday in the courtroom of Carver County District Judge Kevin Eide, who is overseeing the probate case.

Prince's sister, Tyka Nelson, and half-brother Omarr Baker have filed objections to the proposed appointment of L. Londell McMillan, an entertainment lawyer who has been acting as a special adviser to Bremer Trust, the outgoing special administrator appointed by the court after Prince's accidental death from an overdose of painkillers in April.

Nelson and Baker alleged in court filings this week that McMillan has a conflict of interest because he gets a 10 percent commission on contracts the estate has signed thus far to market Prince's music and persona.

The court filings include an affidavit from Randy Jackson, a brother of the late rock star Michael Jackson. He says that when McMillan represented his mother, Katherine Jackson, he did not always act in her best interest but rather, acted at times to enrich himself.

Because Prince left no will, Tyka Nelson, and his half-siblings, Baker, Sharon Nelson, Norrine Nelson, John Nelson and Afred Jackson, are likely heirs to his fortune, which has been estimated at between $100 million and $300 million before taxes, which are expected to claim roughly half.

In a petition filed in December, Tyka Nelson asked for either Fiduciary Trust Co. International or Comerica Bank & Trust N.A. to replace Bremer Trust, which has served as special administrator since shortly after Prince's death. Fiduciary Trust recently withdrew from consideration without explanation. The presumptive heirs now agree that Comerica should oversee the estate. All of the siblings except Tyka Nelson and Baker also want McMillan appointed as co-representative. Baker has proposed having Van Jones, his attorney and a CNN political commentator, act as co-representative.

Attorneys for Tyka Nelson and Baker said that McMillan offered Tyka Nelson a $10 million "no risk" loan, ostensibly to convince her of his ability to act as a representative of the estate. They wrote that McMillan has not produced information needed to assess his ability to act in that capacity, and that he has outstanding judgments against him that raise questions about his financial suitability for the job.

The attorneys wrote that McMillan was retained as an entertainment industry adviser for the estate but "he views himself in a substantially larger role."

"Mr. McMillan has negotiated with the Heirs' counsel on behalf of himself with little input from the Special Administrator or its counsel, Stinson Leonard Street," the lawyers wrote.

They note that McMillan has known Traci Bransford, a partner in Stinson Leonard Street, long before Prince's death. They said they've asked repeatedly, to no avail, how Bremer Trust decided to employ McMillan and why he was allowed to play such a large role.

The attorneys for Tyka Nelson and Baker suggest that McMillan bungled a tribute concert for Prince in October, arranged an after-party using estate assets without informing the heirs, and leaked confidential information to Billboard magazine about the $35 million sale of Prince's "vault masters." (McMillan denied being the source.) They added that McMillan's "behavior on Twitter" โ€” where he cited his ongoing work with the estate โ€” could cause it substantial damage.

Star Tribune reporter Rochelle Olson contributed information to this report.