Dénes' had two older brothers: Tibor Farkas de Boldogfa (1883–1940), landowner, politician, also member of the Hungarian Parliament, and Kálmán Farkas de Boldogfa (1880–1944), landowner, supreme chief magistrate of the district of Zalaszentgrót (Hungarian: főszolgabíró) in the county of Zala.
[2] After high school, he graduated from the Hungarian Academy of Agriculture and soon he administrated his lands in Söjtör and leased the property of the Szombathely priesthood farm in Mezőörs.
On 1912 he married the noble lady Mária Stefánia Szűcs de Szentjános (1891–1956),[3] who gave birth a girl and a boy to Dénes.
Dénes was a politician mainly through his father József Farkas de Boldogfa, who was also a member of the Parliament in the colors of the Catholic People's Party, and was first involved in organizations with agricultural interests.
In 1947 he withdrew from the FKGP and joined the Democratic People's Party in protest of the left-wing movement, which was later included in the parliamentary election on 31 August 1947.
As the oldest member of the former representatives of the Democratic People's Party, on 1 November 1956, he issued a call to Kossuth Radio to reorganize the DNP.
After the fall of the revolution, he was prosecuted by the newly formed Revolutionary Worker-Peasant Government, where he was sentenced to two years in prison.