rooneys-minnesota.com
man‎William ""Big Bill"" Rooney‏‎, son of Michael "Mickey; Michael L" Rooney and Maria "Marie or Maria" Tracy‏.
Born ‎8 Feb 1861 Wakefield Twp, Quebec, Canada, died ‎18 Jun 1931 Sacramento, California, USA Event Description: Saint Marys Catholic Cemetery and Mausoleum‎, age 70 years
In 1915 he's part of a real estate company in Virginia, Rooney & Murphy.

All three of the sons are single and residing together in the 1940 census of Sacramento, California and involved in manufacturing, possibly in relation to the automobile. The sister is in San Francisco. None of the children appear to be married.

Married ‎1899 Virginia, St. Louis County, Minnesota, age 37 or 38 years (married 30 or 31 years) to:

womanCecelia Ann "Celia" Fields‏, age by marriage 32 or 33 years
Born ‎25 May 1866 Canada, died ‎3 Feb 1930 Sacramento, California, USA Event Description: Saint Marys Catholic Cemetery and Mausoleum‎, age 63 years

Children:

1.
man‎William Bartholomew "Bart" Rooney‏‎
Born ‎2 Jun 1900 Virginia, St. Louis County, Minnesota, died ‎10 Oct 1968 Sacramento, California, USA Event Description: Saint Marys Catholic Cemetery and Mausoleum‎, age 68 years
All three brothers are single and residing together in the 1940 census of Sacramento, California and involved in manufacturing, in relation to the automobile.

William was attending high school at St. John's, Collegeville, MN in 1918 when he registered for the WWI draft. In August, 1959 he took a ship to Hawaii, then a territory of the U.S.

2.
woman‎Florence Mary Rooney‏‎
Born ‎21 Sep 1901 Virginia, St. Louis County, Minnesota, died ‎17 Jan 1991 San Francisco, California‎, age 89 years
Jessie Sebbo was born 1980-1989, matches me at 26 cM/1. Ancestry suggests we are 4C1R.

Jessie's mother - perhaps Marie F. Helas. Her father - Robert Nelson Sebbo, Jr., b. 18 April 1946 in L.A. Robert married at least 2x, his first to Debra F. Finneran (b. ~1952), div. on 29 Feb. 1980 in Waukesha, WI, then m. Doreen Barba (b. ~1949) 27 Sep 1980 in Waukesha. Robert, Sr.'s obit. lists two children, Kathleen Sebbo Swanson and Chrissy (Christopher Denny Sebbo Kemnitz - female. Both the mothers of those two children were Larson, according to California birth records. Robert, Jr.'s mother was likely Florence Mary Rooney on the Michael Rooney/Mary Ann Tracy line (alternatively, possibly Pearl Mary Rooney, b. 1926). Jessie's chart shows Robert Jr.'s grandmother was being a Rooney, but the California birth records show his mother as being a Rooney. See explanation below.

I sent a message 12/15/19 and she replied the next day from Georgia : Hey David,

She is not close with me but my Dad still visits her and she is still alive in Kansas City. He's going to see her next weekend and I've asked him to get as much information as he can.
From what he can remember she was an only child. Her mother's last name was Rooney and father had a Scandinavian name like Jorgensen or some thing. He abandoned her and her mother and she was raised with the Rooney family, a bunch of uncles became her father figures. So she took the name.
Let you know when I find out more and will update her profile. Hopefully we will get some documentation.
Jessie

From Jessie after I suggested who I thought her line of Rooney's was and could provide her some good information on this line of her ancestors, 12/22/19:

Awesome! That would be a great help. I was mistaken, my Dad is off to see my grandmother tomorrow for the holiday. He is also going to talk to his half sister, her daughter, to see if she has information. He believes she has worked on genealogical stuff for the family. Maybe even on ancestry.com and that could make things easier for our sleuthing.

I sent a follow-up email March 9, 2020.

3.
man‎Ambrose Thomas Rooney‏‎
Born ‎28 May 1905 Virginia, St. Louis County, Minnesota, died ‎21 Mar 1958 Sacramento, California, USA Event Description: Saint Marys Catholic Cemetery and Mausoleum‎, age 52 years
All three brothers are single and residing together in the 1940 census of Sacramento, California and involved in manufacturing, in relation to the automobile.

4.
man‎George Michael "George Michael Gregory ROONEY; Gregory" Rooney‏‎
Born ‎13 Jul 1908 Virginia, St. Louis County, Minnesota, died ‎22 Jun 1966 St Louis County, Minnesota Event Description: Saint Marys Catholic Cemetery, Sacramento, California‎, age 57 years
All three brothers are single and residing together in the 1940 census of Sacramento, California and involved in manufacturing, in relation to the automobile.

George Rooney took a trip to Southampton, England on 29 Oct 1953 without his brothers.