Patricia, I went back and looked closer at the DNA entry for Archibald Mills 1807, and the lineage presented is from his second wife, who I only have as Caroline T. with 3 sons, Archibald Mills, b. 1858, William M. Mills b. 1864, and Samuel F. Mills, 1867.So it is not one of Adella's sons, but Caroline's by Archibald Mills 1807.
Looking at other trees, I find that Caroline T. may be Caroline T. West, b. 1828.William M is William Morgan and Samuel F. is Samuel Forrest.Just an FYI for your notes.