Eighty-three year-old Katherine Jackson also rebuffed a question yesterday about the amount of money she is seeking in damages from AEG Live, saying: "You can talk to my lawyers about that."
She recalled the only time she asked her son about widespread rumors that he was abusing drugs.
"Well I'm his mother and quite natually he denied because he wouldn't want me to think that .. .. He's not going to admit that," she said, adding that she knew he was taking prescription painkillers.
The Jackson family matriarch accuses AEG Live of pushing her son too hard as he rehearsed in Los Angeles for a series of "This is It" comeback concerts in London, and of negligently hiring doctor Conrad Murray to look after him.
More From This Section
Murray was convicted of involuntary manslaughter in 2011 over Jackson's June 25, 2009 death from an overdose of the surgical anesthetic propofol, administered to help the 50-year-old singer with chronic insomnia.
Katherine Jackson wept in court on the first day of testimony Friday, which was cut short when she appeared confused, a short time after AEG Live's lawyer Marvin Putnam began quizzing her.
Yesterday, Putnam resumed his questioning. In tense exchanges, he asked her about the figure of $1.5-1.7 billion she was reportedly seeking in damages from the tour promoter.
"You can talk to my lawyers about that," she said icily.
He also quizzed her at length about a family "intervention" in 2002, when she and various children including Janet and Rebbie went to confront Jackson about his reported drug problems at his Neverland ranch.