George Clooney's Sister, Adelia "Ada" Zeidler, Dead at 65

George Clooney mourns 'hero' sister Ada after her death at 65: 'I will miss her terribly'

George Clooney's Sister Dies at 65: 'Faced Down Cancer with Courage & Humor'

George Clooney jokes his twins, 8, are 'rotten to the core' as they savagely mock him in Italian so he can't understand