Nixon sister-in-law Clara Jane Nixon dies at 92 IRVINE, Calif. - Clara Jane Nixon, former President Richard Nixon's sister-in-law who maintained the history of the Nixon family in Southern California, has died. The Richard Nixon Foundation says she died of natural causes Saturday in Irvine. She was 92. Clara Jane Nixon was married to Donald Nixon, who gained national attention in 1960 when he received a business loan from billionaire Howard Hughes. The loan raised campaign financing questions during Richard Nixon's presidential campaign. The foundation says Clara Jane Nixon helped recover and preserve the original furniture pieces from the childhood home of the five Nixon brothers. The pieces are now at the Richard Nixon Library & Birthplace in Yorba Linda. She also participated in many events at the library. Clara Jane Nixon is survived by a son and daughter.