István Fáy was born 17 July 1878 in Abaújdevecser, Borsod-Abaúj-Zemplén County, Northern Hungary Region, Hungary to István Fáy (1835-1922) and Amália Básthy (1847-1890) and died 29 October 1916 Budapest, Hungary of Died during military service in WWI.
Siblings
| Name | Birth | Death | Joined with |
| András Fáy (1868-1930) | 20 November 1868 Abaújdevecser, Borsod-Abaúj-Zemplén County, Northern Hungary Region, Hungary | 2 May 1930 Zrenjanin, Central Banat District, Vojvodina, Serbia | Józsa Sebestyén (c1875-c1940) |
| Jolán Fáy (1876-1947) | 13 February 1876 Abaújdevecser, Borsod-Abaúj-Zemplén County, Northern Hungary Region, Hungary | 1 November 1947 Budapest, Hungary | Andor Törős (c1870-c1940) |
| István Fáy (1878-1916) | 17 July 1878 Abaújdevecser, Borsod-Abaúj-Zemplén County, Northern Hungary Region, Hungary | 29 October 1916 Budapest, Hungary | |
| Zoltan Fáy (1882-1967) | 3 February 1882 Gagybátor, Borsod-Abaúj-Zemplén County, Northern Hungary Region, Hungary | 23 December 1967 New York City, New York, USA | Ida Bosnyák (c1885-c1930) Irén Felföldy (c1900-c1980) |