Myles has scheduled a hearing for October 7, according to the Davidson County Chancery Court website.
Seaver, who broke the news of the singer’s death last month in an emotional video, had provided security for Parton for years but was abruptly fired last week, TMZ reported.
That caused Seaver to criticise Nozell, with the outlet quoting Seaver as saying he was “dismayed by the unexpected and, so far, unexplained actions”.
Court papers filed on Tuesday allege Seaver sent threats including a text message warning he would become “the hand of retribution for my entire family”, the New York Times reported.
In a message sent to the New York Times, Seaver, who describes himself as a military contractor and international arms dealer, said he was carrying out his own probe into how his aunt’s affairs were being managed.
Parton died last month aged 80, sparking mourning around the world for the singer who rose from grinding poverty to become a rhinestone-studded icon.
She also starred in Hollywood films and donated millions to charities. Her business empire is worth hundreds of millions of dollars and includes her popular Dollywood theme park, cosmetics, pet apparel, baking mixes and even a truck stop.
The Dollywood theme park in Tennessee attracts about four million visitors a year and employs 4000 people.
– AFP