Susan Powell: Sex with father-in-law?!

Two years after a Utah mother vanished, her case has spiraled into a salacious saga of finger-pointing and accusations of sex and lies between two sparring families, one claiming she ran off with another man, the other just praying she's still alive.
Susan Cox Powell was reported missing in December 2009.
Police say her husband, Josh Powell, is the only person of interest in the case, although he's never been charged.
Josh Powell's family now claims Susan was sexually promiscuous, emotionally unstable and suicidal. Her father-in-law says he and the missing woman interacted in "sexual ways," and that they were in love.
Her father, Chuck Cox, denies the allegations.
The rumors follow a renewed effort in the case and a recent search by authorities for evidence in the Nevada mountains.