He was the third of five children:
In January 1957 Howard Hughes lent Donald Nixon $205,000 to bail out his "Nixon's" drive-in restaurant in Whittier, California. The restaurant went bankrupt less than a year later. Questions about whether this was a political favor dogged Richard Nixon during his campaign for president and later when he sought the governorship of California.
He never lived it down and one of the many speculated motives for the 1972 Watergate burglary that ultimately led to Richard Nixon's resignation was a desire to find proof that the then-Democratic National Committee chairman Larry O'Brien was also secretly working for Hughes. John H. Meier, one of Hughes's former business advisers, in collaboration with former Vice President Hubert Humphrey and others, was using Donald Nixon to feed misinformation to his brother the President. Meier told Donald that he was sure the Democrats would win the election since they had a lot of information on Richard Nixon's illicit dealings with Howard Hughes which had never been released, and that Larry O'Brien had the information
In 1974 the staff of the Senate Watergate committee disclosed additional information to support the charge that Charles Rebozo gave or lent part of a $100,000 campaign contribution to President Nixon's personal secretary, Rose Mary Woods, and to Nixon's brothers, Donald and Edward Nixon.
On June 27, 1987, Donald Nixon died while undergoing hospital treatment for pneumonia. He was 72 years old.