which younger daughter of Richard Nixon was Tricia Nixon Cox also a sister too
Tricia Nixon Cox Patricia "Tricia" Nixon Cox (born February 21, 1946) is the elder daughter of the 37th U.S. President Richard M. Nixon and First Lady Pat Nixon, and sister to Julie Nixon Eisenhower.
Maria Christina O'Connell Maria Christina O'Connell (born October 11, 1960) is the eldest daughter of Daniel Patrick O'Connell and Renate Else Agnes von Kleist. She is the second child in a family of five children and more generally known by her second name, Christina.