Sounds outrageous, but after a Google search, I find:
http://en.wikipedia.org/wiki/Reagan_...pt#cite_ref-19
John Hinckley Jr. is the son of John Hinckley Sr., chairman of the oil company Vanderbilt Energy Corp., who was one of Vice President George H.W. Bush's larger political and financial supporters in his 1980 presidential primary campaign against Ronald Reagan. Also, John Hinckley Jr.'s older brother, Vanderbilt vice president Scott Hinckley, and the Vice President's son Neil Bush, had a dinner appointment scheduled for the next day.[20]
The Associated Press published the following short note on March 31, 1981:
The family of the man charged with trying to assassinate President Reagan is acquainted with the family of Vice President George Bush and had made large contributions to his political campaign....Scott Hinckley, brother of John W. Hinckley Jr. who allegedly shot at Reagan, was to have dined tonight in Denver at the home of Neil Bush, one of the Vice President's sons....The Houston Post said it was unable to reach Scott Hinckley, vice president of his father's Denver-based firm, Vanderbilt Energy Corp., for comment. Neil Bush lives in Denver, where he works for Standard Oil Co. of Indiana. In 1978, Neil Bush served as campaign manager for his brother, George W. Bush, the Vice President's eldest son, who made an unsuccessful bid for Congress. Neil lived in Lubbock, Texas, throughout much of 1978, where John Hinckley lived from 1974 through 1980.