The family doctor told littleJohn that he could save hissister 's life by giving hersome blood . The little five-year- old girl was very neardeath , she was a victim of thesame deadly disease fromwhich John , her elder brotherof age eight , had made amarvellous recovery twoyears earlier. The onlychance for restoration tohealth was a bloodtransfusion from someonewho had previouslyconquered the illness .