 When he was 16, Lemass killed his own baby brother, Herbert, aged twenty-two months, in a domestic shooting accident with a revolver on 28 January 1916.His older brother, Noel, an anti-Treaty officer, was abducted in June 1923 and murdered the following October, when he was 25; the Lemass family believed he was killed by Emmet Dalton.Another of Lemass's brothers, Patrick, died of natural causes at the age of 19 in 1926.