Individual Details

Cathy has Elijah's wife as Martha F. Taylor - she was Martha E. Johnson instead. Margaret Taylor was the second wife.

Marriage records on FamilySearch.org suggest that if Elijah's wife was truly a Taylor, she evidently had a brief earlier marriage. Also perhaps she was a stepdaughter to Taylor. It's hard to image a transcription error between Johnson and Taylor, but there is no actual image available. I believe it's wrong and she was actually Martha Johnson.
Elijah Mims married Martha E. Johnson, 1 Jan 1891, Chilton Co, AL. He was 19; she was 16.
E. P. Mims married Margaret Taylor, 12 Oct 1916, Childton Co and after 1920, his wife in the census is Margaret. He gave his age as 45, hers was 35,

I also found a Martha Johnson in 1880 living in Clanton, Chilton Co AL.
H. C. Johnson, age 24, farmer. Mary, wife, age 30.
Elijah 12 or 13, son [likely a stepson]
M. J., age 7, dau.
James, 5, son.
Martha, 4, dau.
Willie, 2, son.
AL Marriages: H. C. Johnson gave permission for James Johnson to marry Charlotte I. Baker. Undated but James was not yet 21 and listed as probably 1893.

1900 Census. Cooper, Chilton Co AL, Hh 85
Elijia Mimms, b. Aug 1872, age 27, married 9 years
Martha, wife, b. Feb 1877, age 23, 5 children - all living
Minnie, dau, b. Mar 1892, age 8
Maggie, dau, b. Feb 1894, age 6
Lenard, son, b. Nov 1895, age 4
Dora, dau, b. Dec 1897 age 2
Ollie, son, b. Sep 1899, age 7 months

1910 Census. Chilton Co, AL Prec 4. Hh 468
Elijah P. Mims, age 39, married once for 20 years, b. AL, parents b. AL
Martha E., wife, age 36, 9 children, all living, b. AL, parents b. AL
Minnie M., dau 18
Maggie C., dau 15
James L., son, 14
Dorinda, dau, age 12
Allie, son, age 11
Enoch, son age 9
Willie 7
Virgie 5
Clyde, son, age 3

1920 Census. Clanton, Chilton Co AL, Hh 565
Elija P. Mims, 47, b. AL as were his parents, farmer
Margrett, wife, age 40 [Cathy has his wife as Martha Taylor but she died when she was 39, so likely Margret is a second wife]
Willis, son 16. Virge, son, 15. Clide, son, 13. Mildred "son" age 10, marked as a male - probably Melvin. Ola, dau age 6.

1930 Census. Beat 4, Chilton Co, AL, Hh 8 Elijah P. Mims, 58, married 1st at age 20
Margaret, wife, 49, married first time at age 36
Ola, daughter, age 16

1940 Census. Clanton, Chilton Co AL, Hh 40, Temple Church Road
Elijah P. Mims, age 69, b. AL, farmer
Margaret, wife, age 60

Elijah is buried Concord Cemetery, Chilton Co, AL - probably Martha is, too - FindAGrave listing for the cemetery is obviously incomplete.
Alabama Death Records list his father as John Mims.

Birth	Aug 1872	Alabama
Marriage	1 Jan 1891	Chilton County, Alabama - Martha Elizabeth Johnson
Marriage	12 Oct 1916	Chilton County, Alabama - Margaret Josephine Taylor
Death	11 Aug 1958

Spouse	Martha Elizabeth Johnson (1876 - 1915)
Child	Minnie May Mims (1892 - 1945)
Child	Maggie Serena Mims (1894 - 1973)
Child	James Leonard Mims (1895 - 1934)
Child	Dorenda "Dora" Mims (1897 - 1952)
Child	Ollie E. Mims (1899 - 1980)
Child	Enoch Calvin Mims (1901 - 1961)
Child	William Lindsey Mims (1903 - 1945)
Child	Virgil Morris Mims (1905 - 1982)
Child	Clyde Elven Mims (1906 - 1984)
Child	Otis Melvin Mims (1910 - 1972)
Child	Ola V. Mims (1913 - 1997)

Spouse

Margaret Josephine Taylor (1881 - 1943)

Father	John A. Mims (1852 - 1930)
Mother	Penny Carolyn Mims (1854 - 1903)
Sibling	James Washington Mims (1869 - 1928)
Sibling	Sarah E. Mims (1874 - 1906)
Sibling	George Newton Mims (1876 - 1959)
Sibling	Charlott Mahala Mims (1878 - 1964)
Sibling	Rosa Mims (1879 - 1901)
Sibling	Tabitha Jane "Jannie" Mims (1886 - 1961)
Sibling	Missouri Virginia Mims (1889 - 1907)