Mary Alice Luker's parents appear to be John Stuart Luker and Mary Jane Gullet (her marriage record lists her name as Danforth who was her step-father) according to Ancestry researchers.
John S Luker
United States Census, 1860
||John S Luker|
||Rockcreek Township, Bartholomew, Indiana, United States|
|Birth Year (Estimated)
Citing this Record
"United States Census, 1860", database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:M4FC-WNZ : 13 December 2017), John S Luker, 1860.