Okay, I have a quite large civil war history in my family.
CSA:
J.C. Hamilton, 2nd Florida Infantry (Brother of private I.A Hamilton, ironically given the subject matter of this game, killed at Sharpsburg, 20 September '62)
Private I.A. Hamilton, 2nd Florida Cavalry (Direct relative, a multiple times great grandfather)
I know I had a relative with the surname 'Storey' also in the CSA, who's granddaughter would marry the grandson of I.A Hamilton. As well, I had relatives who fought for the CSA in Georgia, North Carolina, and Kentucky regiments, though I do not know their names or units at this time (and will try to update this later).
On the Union side, the only relative I know of was Major General Francis Preston Blair Jr., who would be a cousin.