Is there anything documenting his parents?
Asking because most Ancestry trees have no parents for him. One tree has his parents as:
Father: Edington Jefferson Carter (1811–1902)
Mother: Mary A Watkins (1816–1899)
And when I Googled, I only found a bit more info on his wife but nothing on his parentage.
Nice photo of his wife at this site;
http://www.hctgs.org/Photos/lominack_family.htm
The birth certificate for his daughter Maud Lee Carter and the site with his wife's photo have his middle name as Madison rather than Monroe, so I went ahead and changed that.