Polixena Bánffy de Losoncz was born 8 May 1835 in Breaza, Mureș County, Romania to János Bánffy de Losoncz (1810-1873) and Jozefa Wesselényi de Hadad (1812-1899) and died 28 October 1916 Budapest, Hungary of unspecified causes. She married Kálmán Kemény de Magyargyerőmonostor (1838-1918) 23 August 1861 in Breaza, Mureș County, Romania.
Siblings
| Name | Birth | Death | Joined with |
| Polixena Bánffy de Losoncz (1835-1916) | 8 May 1835 Breaza, Mureș County, Romania | 28 October 1916 Budapest, Hungary | Kálmán Kemény de Magyargyerőmonostor (1838-1918) |
| Mária Bánffy de Losoncz (1840-1900) | 1840 Breaza, Mureș County, Romania | 1900 | Gyula Schwarz |
| Zoltán Bánffy de Losoncz (1841-1892) | 15 September 1841 Breaza, Mureș County, Romania | 7 June 1892 Breaza, Mureș County, Romania | Aranka Bethlen de Bethlen (1839-1872) Erzsébet Teleki de Szék (1853-1937) |
| Jozefa Bánffy de Losoncz (1843-1893) | 1843 Breaza, Mureș County, Romania | 27 May 1893 Brâncovenești, Mureș County, Romania | Dénes Pálffy de Gagy et Tarcsafalvi (1837-1907) |
| Endre Bánffy de Losoncz (1847-1874) | |||
| Rachel Bánffy de Losoncz (1849-1936) | 21 June 1849 Târgu Mureș, Mureș County, Romania | 15 June 1936 | Béla Wass de Czege et Szentegyed (1853-1936) |