John's parents were:
William Bradbury, b. Dec. 31, 1797 and d. Aug. 8, 1880. &
Comfort Burleigh "Cora" Taylor, b. Oct. 25, 1801 and d. Jan. 21, 1884.

In the 1850 U. S. census, 10 yr. old John Q. A. Bradbury, b. in Maine, was attending school and living in Byron, Oxford county, Maine with his
53 yr. old (inferred) father, William Bradbury, a Farmer, b. in Maine
49 yr. old (nferred) mother, Comfort B Bradbury, b. in Maine
24 yr. old (inferred) brother, Horatio F Bradbury, a Farmer, b. in Maine
22 yr. old (inferred) brother, Hazen Bradbury, an Expressman, b. in Maine
20 yr. old (inferred) brother, William G Bradbury, a Farmer, attending school, b. in Maine
17 yr. old (inferred) brother, Albert L Bradbury, a Farmer, attending school, b. in Maine
15 yr. old (inferred) sister, Abagail P Bradbury, attending. school, b. in Maine
14 yr. old (inferred) brother, Heman L Bradbury, attending school, b. in Maine
12 yr. old (inferred) sister, Olive Bradbury, attending school, b. in Maine
7 yr. old (inferred) sister, Margaret Bradbury, attending school, b. in Maine

On Aug. 22, 1867, J. L. (J. Q.) Bradbury and O. B. Austin were marr. in Sonoma county, CA.

John and Ora Bradbury's children were:
1. Flora/Florena/Rena L. Bradbury, b. 1869 and d. Aug. 4, 1938 in Los Angeles county, CA.
2. Arthur William Bradbury, b. May 1, 1875 in Santa Rosa, Sonoma, CA. and d. Feb. 20, 1938 in Los Angeles county, CA.

In the 1870 U. S. census, 28 yr. old Quincy Bradbury, a stock dealer, b. in ME., was living in Petaluma, Sonoma, CA. with his
24 yr. old (inferred) wife, Ora Bradbury, keeping house, b. in ME.
1 yr. old (inferred) daughter, Flora Bradbury, b. in CA.
Quincy's personal estate was valued at $1,000.

In the 1880 U. S. census, 36 yr. old John Q. Bradbury, a cattle dealer, b. in ME., was living in San Rafael, Marin, CA. with his
33 yr. old wife, Ora Bradbury, keeping house, b. in ME.
11 yr. old daughter, Flora Bradbury, attending school, b. in CA.
5 yr. old son, Arthur Bradbury, b. in CA.
27 yr. old Frank Gray, a servant/farm laborer, b. in ME.
20 yr. old boarder, Nettie Ware, a school teacher, b. in NY.
14 yr. old Marie Ross, a servant, b. in Italy.
Ora and John's parents were all b. in ME.

In the 1900 U. S. census, 58 yr. old John Bradbury, a Water Inspector, b. Jul. 1841 in ME., was living at 752 Rampart in Los Angeles Ward 4, Los Angeles, CA. with his
56 yr. old wife, Orianna Bradbury, b. Apr. 1844 in ME.
John and Orianna had been marr. for 34 yrs.
Orianna was the mother of two children, both still alive by this census.
John & Orianna's parents were all b. in ME.

In the 1910 U. S. census, 69 yr. old widower, John Q Bradbury, a City Water Inspector, b. in Maine, was a Lodger at 758 Rampart in Los Angeles Assembly District 72, Los Angeles county, CA.
John's parents were both b. in Maine.