Amy Winehouse's father-in law says fans should stop buying her records to force the singer to seek help for what he called a drug addiction.
Giles Fielder-Civil said he believed Winehouse and his son, Blake Fielder-Civil, had used cocaine, crack cocaine and heroin and were in "abject denial" about their problem.
"I think they believe they are recreational users of drugs and they are in control," Fielder-Civil told British Broadcasting Corp. radio Tuesday. "Clearly they are addicts."
He said fans should send a message to Winehouse "that her addiction and her behavior are not acceptable."
"Perhaps it is time to stop buying records," Fielder-Civil said. "It's a possibility, to send that message."
However, Winehouse's father said a boycott would do little good.
"It's all clutching at straws," Mitch Winehouse told the BBC. "There's only one way out of this, and anybody with any drug experience will tell you ... that the only way out of this is not sectioning them, not locking them up. At some point they are going to reach rock bottom ... and at that point they will say, `Listen, I don't want to do this anymore."'
Giles Fielder-Civil said Winehouse's record label should be more "pro-active in helping the couple to get better."
Island Records said it had done "everything we can to help with Amy's personal problems over the past few weeks."
"She has our full support -- professionally, emotionally and financially," the label said in a statement. "We've advised her to take complete rest during this difficult period and have put all her promotional commitments on hold."
Winehouse, 23, has built her reputation on a soulful voice and a hard-partying image. Her most recent album, "Back to Black," topped the British charts and produced the hit single "Rehab."
Concern for her health has grown since Winehouse was taken to a hospital earlier this month for "severe exhaustion" and spent a short stint in a rehab facility. She has since canceled a series of British concerts and postponed a tour of the U.S. and Canada.
Last week, newspaper pictures showed Winehouse and Blake Fielder-Civil bloody and bruised, apparently after a fight in a London hotel.
Gossip Web site perezhilton.com said it had received text messages from Winehouse denying Fielder-Civil was responsible for her injuries.