I agree with that assessment--Thomas D and Neriah were brothers, and their father was another Thomas Todd. And there were a line of Thomas Todds, a practice that always makes researching family lines interesting. The patriarch of the most colorful line of my own family was William Smith, who since 1799 has begat generations of William Smiths after him. Best guess is there were more William Smiths before him, but because of the name they disappear into a fog of history.
A thought on Capt. Tom Todd and his participation at Centralia--his presence there did not at all follow him like it did to the other senior Confederate leaders, which, I suspect, is a reflection on his local reputation and personal character. While he was incorrectly referred to as a bushwhacker or guerrilla by enemies during the war, no aspersions were cast on him at all after the war. Any stories about the others in following decades generally worked in a mention or two of Centralia, along with words like 'massacre' and 'depredations.' While Todd later moved to Vernon County, immediately after the war he had a prominent continuing working and residential presence not only in the region, but in Centralia itself. One reason he was so hard to get a handle on was that no stories reporting on his post-war work or activity in the area said a word about the battle, making it harder to pin down whether he was our guy or not.
John, thanks again for your help. I'll be doing more work on Perkins Battalion in coming weeks. It was as busy, or even more busy than any other southern unit in the region at the time, but has been eclipsed by the greater focus on the irregulars all around him to the point Perkins Battalion has been almost completely forgotten. And if anything on any of the Todds creeps across your radar, I'm always game to add to my own file.