He was born in 1887 in Villa de los Industriales (Lanús, Buenos Aires). He was the tenth son of Juan C. Farrell (1846–1887) and Catalina Plaul (1852–1917) and the grandson of Matthew Farrell (1803–1860) of
County Longford, which was the family seat of the
Farrell clan in Ireland as Lords of Annaly, and Mónica Ibáñez (1819–1867). ==Military career==