Delia's parents were:
Abner Levi Blackburn, b. Jan. 13, 1827 in Bedford, Bedford County, PA. and d. Nov. 2, 1904 in San Bernardino, San Bernardino County, CA. &
Lucinda Harris, b. Mar. 3, 1822 in South Bend, St. Joseph County, IN. and d. Oct. 11, 1905 in San Bernardino, San Bernardino County, CA.

On Apr. 28, 1852, Abner Levi Blackburn and Lucinda Harris were married in the Old Fort in San Bernardino, San Bernardino county, CA.

Abner & Lucinda Blackburn's children were:
1. Levi Anthony Blackburn, b. 1852 in CA. and d. 1907 in San Bernardino County, CA.
2.John Franklin Blackburn, b. Dec. 4, 1854 in San Bernardino, San Bernardino County, CA. and d. Nov. 30, 1932 in San Bernardino, San Bernardino County, CA.
3. Charles Franklin Blackburn, b. Nov. 12, 1856 in San Bernardino, San Bernardino County, CA. and d. Aug. 30, 1941 in Anderson, Shasta County, CA. Charles marr. Minnie R. Stull in 1881.
4. William Byron Blackburn, b. Apr. 7, 1860 in San Bernardino, San Bernardino County, CA. and d. Mar. 23, 1936 in Alhambra, Los Angeles county, CA. William marr. Jessie P. Bowers.
5. Ella Lucinda Blackburn, b. Apr. 13, 1862 in CA. and d. Dec. 1, 1940 in Los Angeles, Los Angeles county, CA. Ella marr. William Frederick McCaw in 1903.
6. Annette "Nettie" Matilda Blackburn, b. Mar. 6, 1864 in San Bernardino, San Bernardino County, CA. and d. Dec. 12, 1947 in Los Angeles, Los Angeles County, CA. Nettie marr. Thomas Jefferson West in 1887.
7. Mary Adelia "Delia" Blackburn, b. May 17, 1869 and d. Feb. 15, 1902. Mary marr. _ Mulholland.
8. Jesse O. Blackburn, b. Oct. 21, 1871 in San Bernardino, San Bernardino County, CA. and d. Jun. 6, 1957 in Riverside County, CA. Jesse marr. Florence May Elston in 1923.
9. Frederick "Fred" Abner Blackburn, b. Oct. 31, 1874 in San Bernardino, San Bernardino County, CA. and d. Apr. 12, 1919 in Hemet, Riverside County, CA. Fred marr. Mary Lenore Chapman.
10. _ Blackburn

In the 1870 U. S. census, 1 yr. old Adelia Blackburn, b. in CA., was living in San Bernardino, San Bernardino, CA. with her
47 yr. old (inferred) father, A Blackburn, a farmer, b. in OH.
38 yr. old (inferred) mother, Lucinda Blackburn, b. in IN., was keeping house and
17 yr. old (inferred) brother, Levi A Blackburn, working on the farm, b. in CA.
15 yr. old (inferred) brother, John F Blackburn, working on the farm, b. in CA.
13 yr. old (inferred) brother, Charles Blackburn, attending school, b. in CA.
10 yr. old (inferred) brother, William Blackburn, attending school, b. in CA.
8 yr. old(inferred) sister, Ella Blackburn, attending school, b. in CA.
6 yr. old (inferred) sister, Annette Blackburn, attending school, b. in CA.
Abner's real estate was worth $1,000 and his personal estate at $400.

In the 1880 U. S. census, 11 yr. old Delia Blackburn, attending school, b. in CA., was living in San Bernardino, San Bernardino county, CA. with her
51 yr. old father, Abner Blackburn, a Cooper, b. in MO.
49 yr. old mother, Lucinda Blackburn, keeping house, b. in MO.
26 yr. old brother, Levi Blackburn, a Lumberman, b. in CA.
24 yr. old brother, John Blackburn, a Miner, b. in CA.
18 yr. old sister, Ella Blackburn, attending school, b. in CA.
16 yr. old sister, Nettie Blackburn, attending school, b. in CA.
8 yr. old brother, Jesse Blackburn, attending school, b. in CA.
6 yr. old brother, Fred Blackburn, attending school, b. in CA.
Nettie's parents were both b. in MO.

In the 1900 U. S. census, 31 yr. old Adelia Mullholland, b. May 1869 in CA., was living at 390 Mt. Vernon Ave. in San Bernardino Ward 5, San Bernardino county, CA. with her
73 yr. old father (and head of household), Abner Blackburn, b. Apr. 1827 in OH.
67 yr. old mother, Lucinda Blackburn, b. Nov. 1832 in IN.
40 yr. old unmarried brother, Wm B Blackburn, b. May 1860 in CA.
40 yr. old husband, Willard B Mullholland, b. Jul. 1859 in OH.
77 yr. old widowed maternal aunt, Matilda Stout, b. Aug. 1822 in PA.
Lucinda and Abner had been marr. for 48 years.
Lucinda was the mother of 9 children, all still alive by this census.
Willard and Adelia had been married for 1 year and had not yet had children.
Matilda had never had children.
Lucinda's parents were both b. in OH.
Abner's parents were both b. in PA.

San Bernardino Daily Sun (San Bernardino, CA.), P. 4, Col. 3
Sun., Feb. 16, 1902
SUCCUMBS TO TONSILITIS
Mrs. W. B. Mulholland Passes Away After But Six Days' Illness
Mrs. W. B. Mulholland passed away Friday evening, after an illness with tonsillitis of six days. She came here from Lemon, where her husband is in business, a few days ago, to attend her father, Abner Blackburn, who is seriously ill with pneumonia. He resides at Mt. Vernon avenue and Fourth street.
The funeral will be held from the Congregational church Monday afternoon at 3 o'clock.

Two-and-a-half years later, on Nov. 2, 1904, Delia's father, Abner Blackburn died in San Bernardino, San Bernardino County, CA.

Three-and-a-half years later, on Oct. 11, 1905, Delia's mother died in San Bernardino, San Bernardino County, CA.