As the FBI was investigating then-CIA Director David Petraeus in September, he and ISAF Commander John Allen intervened in a nasty custody battle on behalf of Jill Kelley's twin sister, Natalie Khawam, NBC News reported. Petraeus and Allen penned letters attesting to Khawam's good parenting during her battle with ex-husband Grayson Wolfe. At the time, Khawam was seeking to relax a judge's order restricting visits with her son. However, the judge presiding over the case, D.C. Superior Court Judge Neal E. Kravitz had some harsh words for Khawam, finding her to have a "severe deficit in honesty and integrity," NBC News reported. Kravitz also ruled Jill Kelley a "patently biased and unbelievable witness" when she testified about an alleged case of domestic abuse by her sister's ex-husband. The letters came to light just as Kelley became a central figure in the scandal that ultimately led to Petraeus' resignation last week and a Pentagon investigation of Allen over what officials describe as "potentially inappropriate" email exchanges with Kelley.