Whitney Houston's mother says allegations that her superstar daughter and her son were molested by her niece are "unfathomable." Cissy told People magazine that she and her sister, singer Dionne Warwick, first learned of the abuse claims two days before the documentary "Whitney" premiered in May. According to Access Online, the film features interviews from Whitney Houston's longtime assistant who has said Whitney told her that her cousin Dee Dee Warwick molested her as a child and Whitney's oldest brother also claimed he, too, was molested. Dee Dee Warwick died in 2008.