A judge in Montgomery County has heard conflicting testimony about a will ostensibly signed by Pendergrass in May 2009.
The document names Pendergrass' son as executor and sole beneficiary. But widow Joan Pendergrass - the crooner's second wife - contends it's a forgery.
Reports say the case hinges on whether Teddy Pendergrass was able to sign or initial documents.
The singer was paralyzed in a Philadelphia car accident in 1982. He died of colon cancer in 2010 at age 59.
Orphan's Court Judge Stanley Ott listened to several witnesses this week. Joan Pendergrass is expected to testify when the case continues at a yet-to-be determined date.