Regarding Mary E. Higginson b. Dec 1853 Illinois daughter of Fountain Higginson - she married Byrum J. Elliot:
Illinois Marriages, 1851-1900 Name: J. Byrum Elliott Gender: Male Spouse Name: Mary L. Higginson Marriage Date: Oct 31, 1872 Marriage County: White Comments: This record can be found at the County Court Records, Film # 0977068 - 0977072.
1880 IL, White, Gray Elliott, Bryon head 29 M farmer IL ...Mary E. wife 26 M keeping house IL ...Arthur son 7 IL IL IL ...Emily dau 3 IL IL IL
1900 IL, White, Carni City Elliott, Byrum head Dec 1850 49 M 28 yr IL IL KY drayman ...Mary E. wife Dec 1853 47 M 28 yr 5/1 children IL KY England ...Arthur son Aug 1873 26 M 3 yr IL IL IL day laborer ...Bessie M. dau-in-law 19 M 3 yr 2/2 children IL IL OH ...Byrum grandson Sep 1898 1 IL ...Thomas H. grandson Dec 1899 5/12 IL
I did not find Mary nor Byrum after the 1900 census and presume they had died.
Byrum Elliott son of George Elliott b. abt 1829 IL d. bef 1865 and Lucinda Higginson b. 13 Apr 1834 Henderson Co., KY d. unknown.She married William W. Stout before 1870 (other researchers have him as william Short in error).