Jill Kelley is the woman who unwittingly exposed Petraeus's affair with his biographer Paula Broadwell.
The news Friday led to his resignation as the director of the CIA.
Kelley is a Petraeus family friend that Broadwell reportedly felt was a romantic threat and sent her threatening emails.
Kelley reported the e-mails to the FBI.
During the feds' investigation they uncovered the affair.
Action News sat down with Kelley's older brother David Khawam at his law offices in Westmont, New Jersey.
"It's happened extremely quickly, we're talking 12, 24 hours, maximum, since we've found out about this. It's a shock. We're trying to figure out where the pieces are falling right now," Khawam said.
Their family of six moved from Lebanon to Huntingdon Valley, Montgomery County to escape war in the 70s.
"My family is very patriotic; we came from Lebanon at a young age," Khawam said.
Khawam is protective of his sister since the news broke.
"For anybody to say anything defamatory about my sister, to take away from everything she's done and to try to degregate her accomplishments is completely offensive to us," Khawam said.
Kelley's other siblings are in Florida.
Her parents did not answer the door at their Washington Crossing home. They used to own a South Jersey restaurant and their father worked in insurance.
Khawam says he is waiting for more details.
He did reach out to his sister to say this, "The only thing to tell my sister is I love her and I support her."
In a statement Sunday, Kelley and her husband, Scott, said: "We and our family have been friends with Gen. Petraeus and his family for over five years. We respect his and his family's privacy and want the same for us and our three children."
The Associated Press contributed to this article.