Ildiko Fáy was born 9 December 1924 in Budapest, Hungary to Aladár Fáy (1898-1963) and Gizella Csengey (1903-1986) . She married Sándor Ónodi-Szabó (1921) 28 July 1952 in Budapest, Hungary.
Children
| Name | Birth | Death | Joined with |
| Lajos Ónodi-Szabó (1953) | |||
| Virág Ónodi-Szabó (1955) | |||
| Sándor Ónodi-Szabó (1957) | |||
Siblings
| Name | Birth | Death | Joined with |
| Ildikó Fáy (1924) | 9 December 1924 Budapest, Hungary | Sándor Ónodi-Szabó (1921) | |
| Aladár Fáy (1926-1986) | 21 March 1926 Budapest, Hungary | 19 June 1986 Simontornya, Tolna County, Southern Transdanubia Region, Hungary | Éva Élles (1930) |
| Csaba Fáy (1928-2005) | 30 April 1928 Budapest, Hungary | 24 October 2005 Budapest, Hungary | Margit Katalin Virágh (1922) |
| Árpád Fáy (1933) | 23 August 1933 Budapest, Hungary | Emese Péter (1942) | |