Thomas Jefferson Hammer

Author of a Biography of Seth Hammer, his father. The complete book is free at:
https://media.geni.com/p9/2542/3588/53444837b540a659/Biography_of_Seth_Hammer_original.pdf?hash=f4c471eda7bb46502cb7ae0d3522786708e40c49365c0baa6efbf46cae65a3a5.1728629999

Birth: November 22, 1849 - Newton IA -
Death: February 27, 1920 (70) - Los Angelos, CA -

This possibly is him at findagrave, though the death year does not match the above information. His son of the same name is in the same cemetery (https://www.findagrave.com/memorial/181231333) so there's a good chance it's him:
https://www.findagrave.com/memorial/184942734
Thomas J. Hammer, 1849 - 1926 (aged 76–77)
Burial: Calvary Cemetery, Los Angeles, Los Angeles County, California

Son of Seth Hammer and Elizabeth Hackney-
Husband of Mary Price Duncan; Luella Debra Knowles and Mary Ann Pray -
Father of Mary Belle Hammer; Ross Wendell Hammer; Elwood Francis Hammer; Olive Inez Hammer and Thomas Jefferson Hammer

THOMAS JEFFERSON HAMMER was born Nov. 22, 1849 in Iowa and died Feb. 27, 1920 in Los Angeles, Calif. He married (1) MARY PRICE DUNCAN Dec. 1, 1880 in Newton, Jasper Co., Iowa. Mary was born about 1854 in Ohio, the daughter of A.J. Duncan and Mary Smith, and died March 5, 1882. He married (2) LUELLA DEBRA KNOWLES in June 1884 in Denver, Colorado. She died in 1889. On June 4, 1891 in Los Angeles he married (3) MARY ANN PRAY, born April 1864 in Mexico.

Occupation of THOMAS JEFFERSON HAMMER: Journalist, writer; authored biography of his father Seth

Burial information for MARY PRICE DUNCAN: Riverside Cemetery, Denver, Colorado
https://www.findagrave.com/memorial/155184833/mary-price-hammer

Burial information for LUELLA DEBRA KNOWLES: Rosedale Cemetery, Los Angeles, California

Child of THOMAS HAMMER and MARY DUNCAN is:
i. MARY BELLE "MAMIE" HAMMER, b. March 1, 1882; d. July 6, 1895. Burial: Hillsboro Pioneer Cemetery, Oregon

Children of THOMAS HAMMER and MARY PRAY are:
ii. THOMAS JEFFERSON HAMMER, b. June 1892 Calif., d. Feb 27, 1912. Burial: Calvary Cemetery, Los Angeles, Calif
iii. OLIVE INEZ HAMMER, b. Oct. 1893 in California.
iv. ELWOOD FRANCIS HAMMER, b. May 1896 in California.
v. ROSS WENDELL HAMMER, b. Jan. 1899 Calif., d. Oct 13, 1912. Burial: Calvary Cemetery, Los Angeles, Calif

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The authors of the following memorial make it clear they see Mary's father Thomas Jefferson Hammer as a villain who made her unhappy and even contributed to her early death:

Hillsboro [Oregon] Independent, Aug. 9, 1895:

IN MEMORIAM.

Mary Bell Hammer, the subject of this memoir, was born March 1, 1882, and died July 9, 1893, aged 13 years, 4 months and 8 days. When but 5 days old her mamma was called to her heavenly home, and little Mamie was left to the care of strangers. When 4 1/2 months of age, her grandmother (Sister Duncan) and her aunt (Mrs. D.A. Smith) received her into their hearts and homes and gave her such care and love as the dear child needed.

When 9 1/2 year of age her father took her with him to his home in California, where she remained until April, 1895. At that time she returned to the home and love her heart so longed for. How much the heart-yearning for loved ones and home had to do with breaking down the once robust and healthy constitution, making it an easy prey to the dread disease, consumption, we may not now, but when she came back three short months since she was but the shadow of the beautiful child of four years ago, and as we now see it, she was only permitted to come home to close her earthly life in the arms of those who had never ceased to love her. From the time she came into the care of the loved ones named, she had the helps of Godly living, of careful training and a happy christian experience; so much so, that when in her sixth year, she asked to be taken into the church, and thus publicly confess Jesus as her savior. This was gladly granted, and if a patient, obedient, happy childhood, with a prayerful, consistent christian life means anything, little Mamie found Jesus, and proved his promises to be yea and amen.

When she returned to her friends here it was evident to all that her stay would be but short, so everything that could be done to make the way pleasant was done, and in the joy that came to her heart by such tender ministries, she hoped to regain her health and enjoy years of happiness in this happy home, but it was not go to be, for she rapidly gave way before disease until the end came.

The precious words that fell from her lips during the days of her suffering will be remembered with joy for years to come. No words of complaint, but with sweet submission to the will of God, in the furnace she conquered, sin was removed and death had lost it sting.

She called for hymns of Joy and rejoiced in them, and then while her precious lips were chill with the seal of death she prayed--prayed for some of the dear ones who had gone so far away from right; prayed for those who had helped her along life's way.

The last afternoon of life, knowing she must soon go, she called all the friends to her bedside, and after song and prayer, she gave her messages of love for each, divided up the trinkets and keepsakes with those to whom her heart had always clung, and in a few moments fell "asleep in Jesus.”

She is dying; cold drops gather
On her forehead, smooth and high,
And a more than earth light beaming
In her lovely, brilliant eye.

She is dying; ope the window wide,
And let the sunset ray
Greet once more on earth her vision,
Ere her spirit pass away.

Let her breathe the pure air of heaven;
Let her hear the wild bird's song.
Bring some water, cool and limpid,
Moisten her parched lips and tongue.

Now her bloodless lips are moving,
Brighter grows her brilliant eye;
While we watch to catch the whisper
Of her long and last goodbye.

She is dying; see the smile of rapture
Playing on her pallid face.
Bright angelic forms are waiting,
Soon she'll feel their sweet embrace

It is finished; now she conquers,
Homeward has the spirit fled.
Death's cold arms embrace her body
Precious Mamie, she is dead.

Goodbye darling. You, through grace divine, reached the city of God. We, too, by grace shall see you again.

C.M. Bryan
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Marriage record of John James Robinson and Olive Inez Hammer:
California, County Marriages, 1850-1952
Name John James Robinson
Event Type Marriage
Event Date 28 Jul 1912
Event Place California, United States
Age 21
Birth Year (Estimated) 1891
Father's Name James White
Mother's Name Dont Know Historyof
Spouse's Name Olive Inez Hammer
Spouse's Age 18
Spouse's Birth Year (Estimated) 1894
Spouse's Father's Name Thomas Jefferson Hammer
Spouse's Mother's Name May Anna Pray
Page 323
GS Film number 2074049
Digital Folder Number 004929837
Image Number 00983
Citing this Record: "California, County Marriages, 1850-1952," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8DW-LKQ : 8 December 2017), Thomas Jefferson Hammer in entry for John James Robinson and Olive Inez Hammer, 28 Jul 1912; citing , California, United States, county courthouses, California; FHL microfilm 2,074,049.

1920 Census:
Event Place Belvidere, Los Angeles, California, United States
Name, Role, Sex, Age, Birthplace:
Thomas Hammer Head M 70 Iowa
Mary Hammer Wife F 55 Mexico
Elwood Hammer Son M 23 California
District ED 10
Sheet Number and Letter 4B
Household ID 119
Line Number 89
Affiliate Name The U.S. National Archives and Records Administration (NARA)
Affiliate Publication Number T625
Affiliate Film Number 102
GS Film Number 1820102
Digital Folder Number 004964283
Image Number 00269
Citing this Record: "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHQ7-WCG : accessed 6 November 2018), Elwood Hammer in household of Thomas Hammer, Belvidere, Los Angeles, California, United States; citing ED 10, sheet 4B, line 89, family 119, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 102; FHL microfilm 1,820,102.

1910 Census:
Event Place Los Angeles Assembly District 70, Los Angeles, California, United States
Name, Role, Sex, Age, Birthplace:
Thomas J Hammer Head M 60 Iowa
Mary A Hammer Wife F 46 Mexico
Thomas J Hammer Jr. Son M 17 California
Olive T Hammer Daughter F 16 California
Elwood F Hammer Son M 13 California
Ross W Hammer Son M 11 California
District ED 259
Sheet Number and Letter 3A
Household ID 51
Affiliate Name The U.S. National Archives and Records Administration (NARA)
Affiliate Publication Number T624
Affiliate Film Number 81
GS Film Number 1374094
Digital Folder Number 004970259
Image Number 00404
Citing this Record: "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MV2R-J98 : accessed 6 November 2018), Elwood F Hammer in household of Thomas J Hammer, Los Angeles Assembly District 70, Los Angeles, California, United States; citing enumeration district (ED) ED 259, sheet 3A, family 51, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 81; FHL microfilm 1,374,094.