Katalin Wesselényi de Hadad was born 10 September 1805 in Vicenza, Province of Vicenza, Veneto, Italy to István Wesselényi de Hadad (1770-1840) and Rozália Kemény de Magyargyerőmonostor (1783-1861) and died 24 May 1895 Budapest, Hungary of unspecified causes. She married Miklós Bánffy de Losoncz (1801-1894) 1 May 1824 in Cluj-Napoca, Cluj County, Romania. She married János Rhédey de Kisréde (1799-1872) 7 April 1835 in Cluj-Napoca, Cluj County, Romania. She married Sámuel Splényi de Miháld (1812-1867) .
Children
| Name | Birth | Death | Joined with |
| Béla Bánffy de Losoncz (1831-1888) | 30 October 1831 Cluj-Napoca, Cluj County, Romania | 18 November 1888 Sânmihai de Pădure, Mureș County, Romania | Róza Wesselényi de Hadad (1835-1867) Róza Wesselényi de Hadad (1846-1926) |
| Name | Birth | Death | Joined with |
| Stefánia Rhédey de Kisréde (1836-1925) | |||
| Johanna Rhédey de Kisréde (1838-1912) | |||
Siblings