1920 Census shows a Derkin family living at 3123 Mapledale Ave. (ED 89, Sheet 7B) -- this could possibly be John's father, his mother, and his siblings.

RESIDENCES:
1922 - 1813 Forestdale Ave.,Cleveland, Ohio

Derkin, John M., HMW, 58y
, Emma F., WFW, 41y(?)
, Clifford, SMW, 26y,
, John Jr., SMW, 22y, Switchman in railroad yard
, Harry, SMW, 18y,
, Roy, SMW,
, Theresa, DFW, 11y,
, William, SMW, 7y,
, Frances, DFW, 6y

1930 Census, ED 86, Page 17A to 19A
31 Derkin Clifford O. Head M W 37 Ohio 19A Cleveland City 6 77
32 Derkin Clara K. Wife-H F W 35 Ohio 19A Cleveland City 6 77
33 Derkin Gloria C. Daughter F W 5 Ohio 19A Cleveland City 6 77
34 Derkin John M. Father M W 62 Ohio 19A Cleveland City 6 77
35 Derkin William P. Brother M W 18 Ohio 19A Cleveland City 6


Possible family members of John Derkin as found in Cleveland Obituaries:

Name: Derkin, Roy
Date: May 9 1971
Source: Plain Dealer; Cleveland Necrology File, Reel #104.
Notes: Derkin, Roy Derkin, beloved husband of Marie (nee Ferch), brother of John, Harry, Theresa Zibell, William and the late Clifford, Thursday p.m. Funeral services, Monday, May 10, at 1 p.m. at The Wm. Wischmeier & Son Funeral Home, 2709 Archwood Ave., where friends may call Sunday 7-9 P.M.

Name: Derkin, Marian K.
Date: Aug 30 1972
Source: Plain Dealer; Cleveland Necrology File, Reel #104.
Notes: Derkin. Marian K. Derkin, beloved wife of Harry J., sister of Mrs. Helen V. Shields and the late Hal and Ted Kepman, Aug. 28. Services at St. Sede Veneradie Church, 9114 Lake Shore, Mentor, O., Wednesday, Aug. 30 at 10:30 a.m. The family will receive friends at Melbourne's, 7474 Mentor Ave.

Name: Derkin, Isabele M.
Date: Sep 14 1972
Source: Cleveland Press; Cleveland Necrology File, Reel #104.
Notes: Derkin. Isabele M. Derkin, passed away suddenly Sept. 11 at her residence, Indian Lake, Shawnee Island, Ohio. Interment private at Brooklyn Heights Cemetery.

Name: Derkin, Clifford Owen
Date: Mar 3 1966
Source: Source unknown; Cleveland Necrology File, Reel #104.
Notes: Derkin. Clifford Owen Derkin, beloved husband of Clara (nee Hauck), father of Gloria Janos, brother of John, Harry, Roy, Theresa Zibell and William, grandfather of James Owen Janos, Monday p.m., late residence, 3123 Mapledale Ave. Family will receive friends at The Wm. Wischmeier & Son Funeral Home. 2709 Archwood Ave. Ministerial services Thursday, March 3, at 1:30 p.m.

Name: Derkin, Clara K.
Date: Sep 20 1975
Source: Plain Dealer; Cleveland Necrology File, Reel #104.
Notes: Derkin. Clara K. Derkin, (nee Hauck), devoted wife of the late Clifford O., dear mother of Gloria C. Janos (Mrs. Clarence), grandmother of James, sister of Eleanor and Benson of New York, and the late Phillip. Passed away Thursday, Sept. 18. Funeral services Saturday, Sept. 20, at 1 P.M. at The Wischmeier-Buesch Funeral Home, 3111 Broadview Rd. No Visitation. Memorials may be sent to The Cleveland Hearing and Speech Center, 11206 Euclid Ave., Cleveland, O.

Name: Derkin, Josephine
Date: Jun 15 1937
Source: Source unknown; Cleveland Necrology File, Reel #019.
Notes: Derkin: Josephine, 6701 Quimby ave., beloved mother of Isabelle, sister of John, James, Simon and Gertrude Bechlol and Sister Mary Thomas, Monday a. m. Funeral from Spaulding's Funeral Home, 2704 Denison ave., Wednesday at 3 p. m.

Name: Derkin, John M.
Date: May 31 1947
Source: Source unknown; Cleveland Necrology File, Reel #019.
Notes: Derkin, John M., husband of the late Emma; father of Clifford, John, Harry, Roy, Theresa Zibell and William, and grandfather; Friday p. m.; late residence, 3123 Mapledale Ave. Friends may call at Pansler's Funeral Home, 3308 W. 25th St., after 6 p. m. Saturday, where services will be held Monday, June 2, at 2 p. m.

Name: Derkin, Frances E.
Date: Feb. 14, 1925
Source: Source unknown; Cleveland Necrology File, Reel #019.
Notes: Derkin-Frances E., beloved daughter of John M. and the late Emma F., sister of Clifford, John, Harry, Roy, Theresa and William, Wednesday, Feb. 11, at 11:30 p. m., age 11 years. Funeral from late residence, 3123 Mapledale avenue, Saturday, Feb. 14, at 2:30 p. m. Friends invited.

Name: Derkin, Emma F.
Date: May 16, 1924
Source: Source unknown; Cleveland Necrology File, Reel #019.
Notes: Derkin-Emma F., beloved wife of John M., mother of Clifford, John, Harry, Roy, Theresa, William and Francis, Tuesday, May 13, at 7:35 p.m., age 54 years. Funeral from her late residence 3123 Mapledale avenue. Friday, May 16, at 2 p.m. Friends invited.

1. baby DERKIN, [infant] b. 10 Sep 1922, Cleveland, Cuyahoga, Ohio, USA; d. 14 Sep 1922, Cleveland, Cuyahoga, Ohio, USA.
2. Betty Jane DERKIN
3. Donald R. DERKIN b. 24 Apr 1924, Cleveland, Cuyahoga, Ohio, USA; d. 20 Dec 2000.

OCCUPATION:
Railroad Conductor (1900), Watchman (1920)
Switchman for the Erie Railroad

CENSUS:
1900 - 32 Colledge St. [sic], John, Emma, Clifford, Fredrick, John, Henry and Paul (twins).
1920 - 3123 Mapledale Ave., John, Emma, Clifford, John Jr., Henry, Roy, Theresa, William, Frances

RESIDENCES:
1924 - 3123 Mapledale Ave., Cleveland, Ohio <-- per wife's death certificate

OBIT:
Name: Derkin, John M.
Date: May 31 1947
Source: Source unknown; Cleveland Necrology File, Reel #019.
Notes: Derkin, John M., husband of the late Emma; father of Clifford, John, Harry, Roy, Theresa Zibell and William, and grandfather; Friday p. m.; late residence, 3123 Mapledale Ave. Friends may call at Pansler's Funeral Home, 3308 W. 25th St., after 6 p. m. Saturday, where services will be held Monday, June 2, at 2 p. m.

BURIAL:
Brooklyn Hts. Cemetery

DEATH:
Liver cancer.

OBIT:
Name: Derkin, Emma F.
Date: May 16, 1924
Source: Source unknown; Cleveland Necrology File, Reel #019.
Notes: Derkin-Emma F., beloved wife of John M., mother of Clifford, John, Harry, Roy, Theresa, William and Francis, Tuesday, May 13, at 7:35 p.m., age 54 years. Funeral from her late residence 3123 Mapledale avenue. Friday, May 16, at 2 p.m. Friends invited.

1. Clifford Owen DERKIN b. Feb 1892, Cleveland, Cuyahoga, Ohio; d. Mar 1966, Cleveland, Cuyahoga, Ohio.
2. Fredrick A. DERKIN b. Dec 1894, Cleveland, Cuyahoga, Ohio.
3. 1. John A. DERKIN b. Sep 1897, Cleveland, Cuyahoga, Ohio.
4. Henry DERKIN, (twin)
5. Paul DERKIN, (twin)
6. Roy DERKIN d. May 1971, Cleveland, Cuyahoga, Ohio.
7. Theresa DERKIN
8. William P. DERKIN
9. Frances E. DERKIN, [child] b. 11 Oct 1913, Cleveland, Cuyahoga, Ohio; d. 11 Feb 1925, Cleveland, Cuyahoga, Ohio.

1. 2. John M. DERKIN b. 8 Aug 1864, Toledo,, Ohio; d. 30 May 1947, Cleveland, Cuyahoga, Ohio.
2. Alice DERKIN b. Oct 1857, ,, Ohio; d. 6 Sep 1937, East Cleveland, Cuyahoga, Ohio.
3. Michael DERKIN b. 19 Sep 1861, ,, Ohio; d. 9 Oct 1944, Cleveland, Cuyahoga, Ohio.