 Lady Rosebery 's eldest son , Harry , who was less successful in politics than his father and brother , distinguished himself by becoming captain of Surrey County Cricket Club and owning two Epsom Derby @-@ winning horses . He succeeded his father as 6th Earl of Rosebery and died in 1974 . Margaret married her father 's old friend and biographer the Marquess of Crewe . Such was still the fame of her parents that London traffic was brought to a standstill on her wedding day in 1899 . Lady Crewe became one of the first women magistrates in Britain ; she died in 1955 . Lady Sybil has been summarised by one of her father 's biographers : " Even more eccentric than her father , she spent much of her time living in a caravan . " Neil , the second of the Roseberys ' sons , entered politics and a promising future was foretold for him . However , on the outbreak of World War I he joined the army , and was killed leading a charge at Gezer in 1917 . 
 Lady Rosebery <a href='null_genetive' title='1'><mark>'s</mark></a>eldest son , Harry , <a href='null_relcl' title='2'><mark>who</mark></a>was less successful in politics than his father and brother , distinguished himself by becoming captain of Surrey County Cricket Club and owning two Epsom Derby @-@ winning horses . He succeeded his father as 6th Earl of Rosebery and died in 1974 . Margaret married her father <a href='null_genetive' title='3'><mark>'s</mark></a>old friend and biographer the Marquess of Crewe . Such was still the fame of her parents <a href='null_relcl' title='4'><mark>that</mark></a>London traffic was brought to a standstill on her wedding day in 1899 . Lady Crewe became one of the first women magistrates in Britain ; she died in 1955 . Lady Sybil <a href='been_done' title='5'><mark>has</mark></a> been summarised by one of her father <a href='null_genetive' title='6'><mark>'s</mark></a>biographers : " Even more eccentric than her father , she spent much of her time living in a caravan . " Neil , the second of the Roseberys <a href='null_genetive' title='7'><mark>'</mark></a>sons , entered politics and a promising future was foretold for him . However , on the outbreak of World War I he joined the army , and was killed leading a charge at Gezer in 1917 . 
Lady Rosebery  eldest son , Harry , was less successful in politics den his father and brother , distinguished hisself by becoming captain of Surrey County Cricket Club and owning two Epsom Derby @-@ winning horses . He succeeded his father as 6th Earl of Rosebery and died in 1974 . Margaret married her father  old friend and biographer da Marquess of Crewe . Such was still the fame of her parents London traffic was brought to a standstill on her wedding day in 1899 . Lady Crewe became one of the first women magistrates in Britain ; she died in 1955 . Lady Sybil done been summarised by one of her father  biographers : " Even more eccentric than her father , she spent much of her time livin in a caravan . " Neil , the second of the Roseberys  sons , entered politics and a promising future was foretold for him . However , on the outbreak of World War I he joined the army , and was killed leading a charge at Gezer in 1917 .