Robert F. Kennedy Jr.'s marriage to wife Cheryl Hines is "hanging by a thread," according to bombshell claims in a new book. Wonderwall.com can reveal the couple's relationship, which was rocked by Kennedy's dalliance with journalist Olivia Nuzzi, has yet to recover from his alleged infidelity, according to author Isabel Vincent, who details how the prospect of a 2028 presidential run is the only thing keeping them together. RFK Jr. and Cheryl Hines are 'drifting' Robert F. Kennedy Jr. and Cheryl Hines are spending less time together, which has impacted their marriage.