Attorneys representing two people claiming to be among Prince's heirs have filed a constitutional challenge to the requirement that they substantiate their claims with genetic evidence.
Their attorneys say the requirement violates the equal protection clauses of the Minnesota and U.S. constitutions.
The objection, made public Friday in Carver County District Court, was filed on behalf of Brianna and Victoria Nelson, who claim they are Prince's niece and grandniece, respectively.
They are the daughter and granddaughter of the late Duane Nelson Sr., whom they contend was one of Prince's half-siblings.
Prince died April 21 of an accidental overdose of fentanyl, a powerful opioid painkiller.
Because no will has been found, Minnesota law determines how his vast estate, estimated at $100 million to $300 million before taxes, will be distributed.
Carver County District Judge Kevin Eide has certified as presumptive heirs Prince's sister, Tyka Nelson, and his half-siblings, Sharon, Norrine and John Rodger Nelson, Alfred Jackson and Omarr Baker.
Some have challenged assertions that Duane Nelson was actually one of Prince's half-siblings. Eide ordered Brianna and Victoria Nelson to prove their claims with genetic testing.