I knew the sad story of celebrated cellist Jacqueline du Pré (played by Emily Watson), yet I didn't realize her sister Hilary (Rachel Griffiths) was also a talented flautist, nor that there were supposedly some complicated dynamics within their family’s relationships. Early on, both girls are pushed by their parents (Celia Imrie and Charles Dance) to work diligently and perform at their highest level, quickly becomin…