I wonder if Dr Thomas Warner Meriwether of Richmond VA, who died in the middle of the Civil War, could somehow be related to the Warner Hall Lewis family of Meriwether Lewis. If so then he could be related to Pittsburgh lawyer Edwin M Stanton married to Ellen Hutchison a direct descendent of Meriwether Lewis.
Edwin M Stanton was Lincoln's Secretary of War. His aide was General Harry Halleck who was married to Alexander Hamilton's granddaughter. For sure Captain Meriwether Lewis was Col Alexander Hamilton's aide during the Pittsburgh Whiskey Rebellion of 1794. General Robert E Lee's father named General Harry Lighthorse Lee was their boss.
Then again the names Warner, Lewis, Meriwether, Lee are all common names in Richmond VA during the Civil War.