The results revealed on Thursday's "Inside Edition" program come years after Suzan has tried to get Jerry Lewis to acknowledge her as his biological daughter.
To help her find out, Jerry's son Gary agreed to a DNA request by "Inside Edition" to test the claims of Suzan Lewis.
Gary Lewis told the TV show that since meeting her several years ago, he has always believed that they shared a father. Suzan's late mother claimed she had an affair with the comedy star, which resulted in her birth in 1952.
Jerry Lewis, who recently received an Oscar for his humanitarian work, has never publicly acknowledged Suzan as his daughter and declined comment for an "Inside Edition" report last month on her paternity claims.
Gary Lewis told the program he agreed to the test because he "thinks everybody deserves to know where they came from and who they are."