Prayer may be powerful, but it hasn't kept one Ohio televangelist out of court.

Darlene Bishop is being sued by the four grown-up children of her late brother for allegedly convincing him that prayer alone would cure his cancer, The Daily Mail reports. Bishop, the co-pastor of Solid Rock Church in Monroe, wrote in a book that Darrel "Wayne" Perry was cured of his throat cancer despite his having passed away from the disease in a year and a half ago, the lawsuit claims.

Perry's eldest son Bryan, who is also suing Bishop for allegedly mismanaging his father's multi-million dollar estate, said family members were duped by her promises of faith healing.

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"She's lying to people and exploiting my father for her own financial gain," Perry said. "I put my faith in Darlene. We all did. We thought she was a holy, pure woman."

Bishop, whose Christian TV show "Sisters" is seen by millions in over 200 countries, called the allegations "complete lies" on her Web site.

"I encouraged him to listen to the doctors, but he refused surgery saying he would rather die than have his voice box removed," Bishop wrote on her blog.

Bishop claims that she was cured of breast cancer in 1986 after praying to God. She admitted in a deposition in the case, however, that a doctor never diagnosed her with the disease.