 Balfour 's drinking problem became serious around 1906 , and in 1909 his health began to deteriorate seriously . In December 1910 he returned to Whittingehame , where he died aged 56 at 6am on 14 February 1911 , surrounded by his family . Eustace was the third of the five Balfour bothers to die relatively young , Cecil and Francis having both been killed in accidents in the early 1880s . 
