Janis, who recently revealed that she was in "denial" when the 27-year-old singer was found dead at her Camden phone earlier this year, said that Amy would be delighted with the drug charity foundation that has been set up in her honour by her family and fiancé Reg Traviss.
She told the Sunday Mirror: "Amy would have been proud of the foundation. She loved people and she adored children. She was an incredible person who everyone loved: kind, sincere and generous. Her legacy and all she achieved will live on for ever."
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Janis said of Traviss: "I remember the moment Amy met him. She phoned and said, 'Mum I've met this man... I've fallen in love'. I was delighted. When I met him I thought he was great. Amy wanted kids with Reg and to turn the house in Camden into a family home. It's fitting the home will now be used for the foundation."
Refusing to discuss Amy's ex-husband Blake Fielder-Civil, who allegedly introduced her to drugs, Janis said: "I have nothing nice to say about him. I would prefer him not to write [a rumoured tell-all] book as it will bring back too many memories."
Watch Amy Winehouse and Tony Bennett's 'Body & Soul' video, released to mark the launch of her Foundation, below: