 Mary Shelley 's first concern during these years was the welfare of Percy Florence . She honoured her late husband 's wish that his son attend public school , and , with Sir Timothy 's grudging help , had him educated at Harrow . To avoid boarding fees , she moved to Harrow on the Hill herself so that Percy could attend as a day scholar . Though Percy went on to Trinity College , Cambridge , and dabbled in politics and the law , he showed no sign of his parents ' gifts . He was devoted to his mother , and after he left university in 1841 , he came to live with her . 
