05/24/2004 at 03:00 PM EDT
Keeping it all in the family, Jack Osbourne interviewed his older sister Kelly for British TV on Monday night, with each discussing his and her problems with substance abuse.
Ozzy and Sharon's daughter Kelly, 19, said on ITV1's Tonight program that she turned to alcohol and drugs to deal with the hardship of being a "chubby English girl" and having to adjust to life in America.
Admitting that she was basically under the influence from the time she was 12, "I was completely and utterly miserable," says Kelly, who reportedly was released from rehab only days ago.
"Painkillers weren't the only drugs I did," she says, according to the BBC. "Towards the end, there wasn't a second in a 24-hour day that I wasn't high on something."
She added: "In the beginning, you do it because it makes you feel good and then it gets to the point were it stops making you feel good and you do it because you don't know what else to do," she said.
On the same program, Jack, 18, admitted to feelings to suicide before he checked into a Malibu rehab clinic for his own drug addiction. (He said his drug use was a result of the stress and the success of the family's MTV show The Osbournes.)
"What no one knew as I was filming the second (season) of "The Osbournes was that aged just 16 I was struggling with a serious addiction to a painkiller called Oxycontin or 'Hillbilly heroin'," he said.
Referring to a scene from that season, he says: "My drug taking made me so miserable that just months after this footage was recorded I tried to kill myself." He also said that he has been clean and sober since his release from rehab.
On the same program, Ozzy, 55, admits about his and Sharon's discovery of their children's problems: "We were in denial. You always want to think it's somebody else's kids, not your own."