Why did Sophie like her brother Geoff more than any other person? From her perspective, what did he symbolise?

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 and she fancied herself wearing glamorous clothes and being welcomed by everyone. For Sophie, Geoff symbolised liberty from the monotonous life they had been living.