"For a well modelled thigh, you would recommend Michelangelo. For a radiant face, Rembrandt. But to whom would you turn for a supremely expressive hand? Egon Schiele, (b. 12 June 1890) the Austrian Expressionist who died at the age of 28 in the great flu pandemic of 1918, was a master of hands, and there is an enormous range of them throughout his work. There are long, thin, ivory-spindle-like hands which slide up the cheek; there are hands which drag at the flesh beneath the eye, making it bulge weirdly. There are hands which seem to snake around and almost to engulf the body, making it seem knotted and strangely tortured." (ref)
Anent Gemini's sibling associations: Schiele lived in a scandalous menage a trois with his wife and her sister, and he is believed to have had an incestuous relationship with his own sister.