NEW YORK _ The family of Harry Houdini's widow wants to block a plan to dig up the remains of the escape artist. They say the whole thing smacks of a publicity stunt. Houdini's grandnephew announced last week he's backing an exhumation to determine whether his famous relative was poisoned. A recently published biography says before his death in 1926, Houdini had received death threats for debunking the Spiritualist movement, which claimed to be able to contact the dead. Houdini died on Halloween at a Detroit hospital. No autopsy was ever conducted, but his death certificate says he died as the result of a ruptured appendix. The grandnephew of Houdini's widow, Bess, says she never would approve of disinterring her husband's remains. They're considering legal action to block it.