From the LDS-IGI:
Elmer E. Calton wed Alice V. Krall 02 May 1897, Lawrence, Tennessee.
I have photos identified on the back as:
"Aunt Alice and Uncle Elmer and sons Paul and Fred Calton"
"Lela Calton, Aunt Alice Krall Calton's daughter"
In his mother's probate record Noah is mentioned:
“Noah Krall, Son, Ethridge Tenn.” (in 1899)
Noah Frank Krall, wife Adelia (Moore) and children are listed in the 1900 Federal Census:
1900 Federal census, 10th Civil district, Lawrence county, Tennessee, page 52A, enumeration district 46, sheet 7:
Krall, Noah F., Head of household, white, male, born Apr 1855, age 45, Ohio, father born Ohio, mother born Ohio, farmer, can read, write, speak English, owns home, free of mortgage, farm, schedule 68.
Adilla, wife, white, female, born July 1862, age 37, Ohio, Ohio, Ohio, can read, cannot write, can speak English.
Deo E., son, white, male, born April 1887, age 13, Ohio, Ohio, Ohio, farm laborer, 5 years school, can read, write, speak English.
John C., son, white, male, born Feb. 1888, age 12, Ohio, Ohio, Ohio, farm laborer, 5 years school, can read, write, speak English.
Benton, son, white, male, born Apr 1891, age 9, Ohio, Ohio, Ohio, at school, 4 years school. [This is Bert Leo Krall, my grandfather.]
Ray A., son, white, male, born Dec 1895, age 4, Tennessee, Ohio, Ohio.
also in household:
Smith, Rhody, servant, white, female, Aug 1876, age 23, married, born Alabama, father born Georgia, mother born Alabama, housekeeper, can read, can write, can speak English."
Do you have any further information about Elmer and Alice, in particular where in Missouri they might have lived?