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man‎Francis Felix Darcy‏‎, son of Felix Ignatius Darcy and Bertha A France‏.
Born ‎14 Aug 1904 Giltedge, Fergus County, Montana, died ‎23 Apr 1986 Lewistown, Fergus County, Montana‎, age 81 years
They're hard to find in the 1940 census because the index has the last name spelled "Derolf," even though it's spelled correctly (though indistinctly) on the actually census sheet.

Married ‎10 Nov 1928 Lewistown, Fergus County, Montana, age 24 years (married 57 years) to:

womanHazel Anna Barry‏, age by marriage 24 years
Born ‎30 Apr 1904 Giltedge, Fergus County, Montana, died ‎24 May 1986 LewistownFergus County, Montana‎, age 82 years

Children:

1.
womanMadonna Lee "Donna" Darcy‏
Born ‎29 Oct 1933 Lewistown, Fergus County, Montana, died ‎22 Nov 1993 Conrad, Pondera County, Montana Event Description: Lakeview Cemetery‎, age 60 years
Madonna Lee "Donna" Lund died Monday in the Conrad Hospital after a lengthy illness.

Vigil services will be at 7 P.M. on Monday and funeral services at 1 P.M. Tuesday at St. Francis Church in Valier. Burial will be at Lakeview Cemetery. Memorials are suggested to the Humane Society. Pondera Funeral Home is in charge.

She was born October 29, 1933 in Lewistown to France and Hazel Darcy. She graduated from St. Leo's and furthered her education at the Holy Names College in Spokane, WA. She was a legal secretary for Howard Gee, Lewistown and Jess Angstman Sr., Havre. Later she worked in several restaurants and lounges in Valier and Conred.

She is survived by a daughter, Velda Loch of Valier; a son, James Lund of Great Falls; a brother, James Darcy of Bozeman; one nephew and two nieces.

2.
manJames Edward Darcy‏
Born ‎26 Jul 1935 Lewistown, Fergus County, Montana, died ‎19 Sep 1996 Bozeman, Gallatin County, Montana‎, age 61 years