Patrick Kennedy is the son of Edward Kennedy and his first wife, Joan Bennett Kennedy. He has two siblings: Kara (b. 1960) and Edward, Jr. (b. 1961)… Patrick Kennedy entered the Mayo Clinic to be treated for addiction to prescription medicines in May of 2006, after crashing his Mustang convertible into a security barrier near the U.S. Capitol late at night. Kennedy denied he had been drinking, saying that he had suffered a bad reaction to the prescription drugs Phenergan and Ambien. Kennedy had been treated at the Mayo Clinic for the same addiction late in 2005. Kennedy had previously admitted to using cocaine while a teenager. In June of 2006 he pled guilty to driving under the influence of intoxicants and began a year of probation and court-ordered drug treatment.