On the Larry King show, the Condits said their father splits time between California and his Arizona home and that much of his focus is on trial preparations for an $11 million defamation lawsuit against author Dominick Dunne.
Cadee Condit said the family couldn't just let things go and get on with life.
"Innocent people fight back," she said. "Dominick Dunne crossed a line, just as the tabloids did. They called my dad a murderer, insinuating that he had something to do with the kidnapping of Chandra Levy. He's innocent. He didn't have anything to do with it, and Dominick needs to be held accountable for that."
The Condit children also reported that their mother was in good health and they were active with the Justice Political Action Committee, trying to extend the California deadline for filing libel lawsuits from one year to three years.
The children reaffirmed their contention that their father never had a romantic relationship with Levy and that there was nothing wrong with his conduct during the investigation.
"He did the responsible thing," Chad Condit said. "He contacted the FBI, contacted the Washington, D.C., Police Department to let them know that this girl was missing when the father contacted Gary. He didn't do anything criminal. He's never been charged with anything.
"If Chandra wouldn't have disappeared, he would have won the election, got his 80 percent."