MINNEAPOLIS — The wrangling over Prince's estate began formally Tuesday when one of his siblings filed an emergency motion in Carver County District Court to have a special administrator appointed to gather and protect his assets.

The filing by Tyka Nelson said that to the best of her knowledge, her brother left no will.

Lawyers who handle intellectual property and estate planning for other superstars say it may take years to find out.

It's impossible to say at the moment what Prince was worth when he died, said Paul Bezilla, a lawyer with Lommen Abdo in Minneapolis, a firm that has represented other major celebrities, including Count Basie and Buddy Holly.