Need help with Spence Tree.

Mothers Family Line

Ulysses Ulyses S Cox 1831
Mary J Short 1844
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Veloras B Cox 1874
Marie C Ensor 1887
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Mary Frances Cox 1917-2000
Elbert R Spence 1916-1998
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Living Spence 1956
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Need info for.......
Ulysses S. Cox
DOB Oct 1831 Indiana
DOD Oct 1901 Dekalp, Missouri
Home in 1880 and 1900: Polk, De Kalb, Missouri
Married Mary J Short in 1870.

In 1880 census shows Elizabeth as daughter but he was married just ten year earlier in 1870 so Eliz = Sister ?
Elizabeth A. Cox 18 Possible sister of Ulysses
Margie N. V. Cox 9 daughter
Veloris B. Cox 6 son
Irene E. Cox 4 daughter

Thank You.
============Info Documents===========
Missouri Marriage Records, 1805-2002
about Mr Ulysses Cox
Name: Mr Ulysses Cox
Marriage Date: 15 Mar 1870
Marriage County: Andrew
Spouse Name: Miss Mary J Short
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1880 United States Federal Census

Name: Ulysses S. Cox
Home in 1880: Polk, De Kalb, Missouri
Age: 48
Estimated Birth Year: abt 1832
Birthplace: Indiana
Relation to Head of Household: Self (Head)
Spouse's Name: Mary J. Cox
Father's birthplace: Kentucky
Mother's birthplace: Kentucky
Neighbors: View others on page
Occupation: Farmer
Marital Status: Widower
Race: White
Gender: Male

Household Members: Name Age
Ulysses S. Cox 48
Mary J. Cox 36
Elizabeth A. Cox 18
Margie N. V. Cox 9
Veloris B. Cox 6
Irene E. Cox 4
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1900 United States Federal Census

Name: Ulysses S Cox
[Abysses S Cox]
Home in 1900: Polk, De Kalb, Missouri
[Union Star, De Kalb, Missouri]
Age: 68
Birth Date: Oct 1831
Birthplace: Indiana
Race: White
Gender: Male
Relationship to head-of-house: Head
Father's Birthplace: Kentucky
Mother's Birthplace: Indiana
Spouse's Name: Mary E Cox
Marriage Year: 1886
Marital Status: Married
Years Married: 14

Household Members: Name Age
Ulysses S Cox 68
Mary E Cox 67
Veloris B Cox 26
Abraham L Castro 55 he was a boarder at their house.
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Will of Ulysses Info
name: Cox, Ulyses
executed: 10/07/1901
amitted: 10/11/1901
spouse: Mary E.
children: V. B., Elizabeth A. Hoffman, Essie Griggs,
J. K. Farrington, A. J. Haddix
Exe: son V. B.