MINNEAPOLIS - A top Minnesota probate lawyer says resolving Prince's estate may get extremely complicated if his siblings and half-siblings can't agree how to do it.

Prince's sister, Tyka Nelson, filed court documents Tuesday saying she knew of no will and asked the court to appoint a corporate trust company to oversee his estate.

Susan Link is head of the estate planning group at the Maslon law firm. She says that if Prince left no will or trust, it's going to be important for lawyers to get the siblings to agree on how to divide his complex estate.

Nelson is Prince's only full sibling. Her court papers list five half-siblings who also stand to share in the estate.

Prince died Thursday at age 57. An autopsy was done last week but results aren't expected to be released for weeks.