Sienna Miller's sister has revealed that their father, American former banker and art dealer Edwin Miller, is 'withdrawing from the world' with Alzheimer's disease. 'I miss him beyond description,' bridal wear designer Savannah, 44, says. 'As his Alzheimer's progresses and he slowly withdraws from the world, my heart aches for this man. 'His hugs are still as deep, thank God, but the life and spark, that was all pervading, has gone out. 'The sisters' mother is ex-model Jo Miller, who was married to Edwin until 1987.
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