why did sophie like her brother geoff more than any other person?what did he symbolise for her?

Sophie liked her brother, Geoff, more than anybody else because he was not in the habit of talking much and remained lost in his own thoughts. She envied his silence and thought that he had access to an unknown world. She wanted to be a part of that world where she fancied herself wearing glamorous clothes and being welcomed by everyone. For Sophie, Geoff symbolised liberty from the monotonous and colourless life they had been living.