Surname most often seen as Jenkins, name used by first wife and children. However, his military marker and his double marker with Caroline are engraved "Jinkens", and used here per Find-a-Grave guidelines.

Son of William and Lydia A. Jenkins (Jinkens/Jenkins)

m1: Martha Magdalene Lauck, 29 Oct 1860, Carroll Co. MO.
ch inc:
-Alice Rebecca Jenkins 1861–1865
-Anna Eliza Jenkins 1863–1953 m: Oliver
-William Madison Jenkins 1865–1930
-Cornelia Isabella Belle Jenkins 1865–1954 m: Winfrey
-Geneva May Jenkins 1867–1931 m: Haworth
-Rebecca "Becky" Elizabeth Jenkins 1869–1926 m: Jeffries
Martha died 1872.

m2: Emma Anna Chism, September 15, 1872, Carroll County, Missouri
ch:
-John Arthur Jenkins October 26, 1873-1940
(note: John A's death cert shows mother as Ann Chism; Carroll County history book states that John Arthur's mother was Emma Anna Lauck - researching. Emma may have died about 1878, before John J's January 17, 1879 marriage to Caroline.)

m2: Mrs. Caroline G Busick Jenkins, 1879, in Carroll Co., MO. Caroline was widow of John's uncle, Calvin Jenkins, and she brought daughters, Lena, Carrie and Ada to the marriage.

1850 Carroll, MO: JENKINS William/35, Lydia A/36, Louiza/14, John/11, Polly/7, Barthina/3.

1860 Hurricane, Carroll Co MO: JENKINS William/48, Lyda A/48, John/20, Joseph/19, Barthina/13, Wm/4; JENKINS Calvin/36/brother and wife CAROLINE/18, Mary/3. Also in household: JEANES Joseph/19/VA (son of Thomas W. & Sarah Jeanes)

1870 Carol Co MO: JENKINS John/30/OH, Martha/30/OH, Anna L/7, William/5, Isabella/4, Geneva/3, Rebecca/9 mo; (children all born in MO); REED Martha/16/Arkansas/domestic servant.

1880 Carroll Co MO: JENKINS John/40, Caroline/36, Annie/19, William/16, Geneva/15, Rebecca/14, John/7, Stepdaughters JENKINS Lena/12, Carrie/8, Ada/6.

1900 Lawrence MO: JENKINS John J/60/Feb-1840/OH-KY-OH, Caroline/57/Jun 1842/IL-Unk-IN. Married 16 yrs, she has 2 of 8 ch living.

1910 Henry MO: JINKENS John/70/OHx3, Caroline/66/IL-OH-IL; Md 25 yrs, 2ndd for both, she has 1 of 7 ch living.

1920 Henry MO: JENKINS Jno J/78/OHx3, Caraline G/77/MO-IL-IL.

mil: Co F 4th Prov En MO Mil

Missouri Marriage Records, 1805-2002
Name John Jenkins
Marriage Date 29 Oct 1860
Marriage Place Carroll, Missouri, USA
Registration Place Carroll, MO.
Spouse Martha Lanch

Missouri Marriage Records, 1805-2002
Name John Jenkins
Marriage Date 20 Jan 1879
Marriage Place Carroll, Missouri
Registration Place Carroll, Missouri
Spouse Caroline Jenkins

Mo. death cert. filed as John Jenkins
84Y 3M 1D
Married
Farmer
Informant: George Duvall, Calhoun, son-in-law
Burial: May 28, 1924, Calhoun Cemetery

Research: Son John Arthur's obit states he was survived by 4 half sisters and 1 half brother. Since John and Caroline had no children together, it would seem the half-siblings were from his mother, Emma Anna "Ann" Chism, and her prior marriage. All of his half siblings and known step siblings from John and Caroline predeceased him.

Note: Thanks to Linda (48001474) for spouse name/date of 2nd marriage. Unclear if her maiden name was Chism or Lauck. Research, is the Sarah Chism/IL/9-1871, granddaughter in home of Reubin and Sarah Chism, Wood, Carroll Co MO. in 1880, possibly Ann/Emma's child? Same location where she would have lived with John after 1872 marriage and where she is presumed to have died about 1878,