Tonight on ET: Rielle Hunter’s Sister Reveals Secrets

Is she or isn't she? John Edwards and Rielle Hunter's rumored love child, Frances Quinn Hunter, is now almost 18 months, and now Rielle's estranged sister, Roxanne Druck, is revealing secrets about the former presidential hopeful and his former mistress -- from whether or not they have taken a DNA test to a possible sex tape.

"I believe when two parties have a question of who's the parent, if there is any kind of paternity question, obviously the only way to move forward with a paternity settlement would be having a test done," says Druck. "I personally have not seen any results for the DNA test, but I can tell you 100 percent John Edwards is the father of my sister's child."

As for whether or not the two are in contact, Druck replies, "They definitely communicate. They have a daughter. They definitely communicate."