Considering her singer daughter-in-law's well-known troubles with substance abuse and the law, it's no surprise that the outspoken Georgette Civil, Blake Fielder-Civil's mum, thinks Amy Winehouse ought to be in the big house.

"Prison will do Amy far more good than rehab," Civil has told Britain's News of the World, the New York Daily News reported Sunday. "The police know Amy is a drug addict — and she has now been caught twice on film taking illegal drugs. They should arrest her and put her behind bars."