The Fanny B Medlin b. TN parents are eventually found in MO where Walter Keener was born. May or may not be a connection. Maybe you will recognize Fannie's siblings names?
https://familysearch.org/search/records/index#count=20&query=%2Bgivenname%3A%22lena%20arlena%22~%20%2Bsurname%3Amedlin~%20%2Bbirth_place%3ATN~%20%2Bbirth_year%3A1867-1873~%20%2Bspouse_givenname%3Ajoseph~%20%2Bspouse_surname%3Amedlin~
US Census, 1910 Denver Ward 15, Denver, Colorado
Joseph B Medlin M 41 TN
Lena E Medlin F 39 TN
DAU Fannie B Medlin F 20y TN
SON Caroll H Medlin M 18y TN
DAU Josephine R Medlin F 16y TN
DAU Rachael A Medlin F 13y TN
DAU Gertie E Medlin F 11y TN
DAU Mary A Medlin F 8y TN
DAU Olga M Medlin F 6y TN
DAU Margaret E Medlin F 3y TN
DAU Nellie D Medlin F 1y TN
US Census, 1900 ED 80 Civil District 11, Knox, TN
Head Joseph B Medlin Jan 1870 TN married 12 yrs
Wife Arlena E Medlin Jan 1872 TN
Daughter Fannie B Medlin July 1889 TN
Son Carrol H Medlin July 1891 TN
Daughter Josephine R Medlin Nov. 1893 TN
Daughter Rachel A Medlin June 1896 TN
Daughter Girtrude E Medlin Feb 1899 TN
Census 1930 Springfield, Greene, MO
Head Joseph B Medlin M 61 NC
Wife Lena A Medlin F 59 TN
Daughter Helen E Medlin F 11 MO
Son-In-Law Elston E Minor M 26 MO
Daughter Nelle D Minar F 21 TN
US Census 1940 Jackson Township,Greene, MO
Head Joe B Medlin M 71 TN
Wife Lena E Medlin F 69 TN
Son-in-law Dewey Kelley M 41 MO
Daughter Gertrude Kelley F 40 TN