Carlin Q. Williams, a little-known 39-year-old rapper whose mother says she had sex with Prince in a Kansas City hotel, had requested a second genetic test, a court document showed.
In an order signed last week but made public today, a judge in the suburbs of Prince's hometown Minneapolis, Minnesota, asked Williams to undergo the new test by September 14.
Judge Kevin Eide gave Williams' lawyer until August 31 to choose a place to conduct the test, with the court to select one if not.
Williams is serving a sentence in a high-security federal prison in Florence, Colorado for gun possession in a stolen car.
Williams, who has been in trouble with the law since his youth, raps under the stage-name Prince Dracula and has a song about killing his purported father.
His mother, Marsha Henson, said in a sworn statement after Prince's April 21 death that she had unprotected sex with the singer in 1976.
Prince, who died at age 57 from an overdose of painkillers, did not leave a will. The "Purple Rain" icon's estate is estimated to be worth hundreds of millions of dollars and includes vaults filled with unreleased material.
Prince's immediate heirs are his sister Tyka Nelson and five half-siblings. Eide has ordered genetic testing for two people who say they are heirs through Prince's late half-brother Duane Nelson.
The judge last month dismissed 29 claims to Prince's fortune, some of them colorful.
Eide today barred further correspondence to the court from one rejected claimant, Claire Elisabeth Nelson, who said she secretly married Prince in Las Vegas in 2002 and that his 1984 hit "I Would Die 4 U" was about her.
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