On which side did Keller's relatives fight in the American Civil War?

Both sides of Helen Keller's family fought for the Confederacy in the Civil War. Her mother was named Kate Adams. Kate's grandparents had lived in Newburyport, Massachusetts, but their son, Charles Adams, moved from Massachusetts to Arkansas. Charles fought in the Civil War on the side of the Confederacy and became a brigadier-general. In addition, Helen's father, named Arthur, had been a captain in the Confederate Army. Born in Tuscumbia, Alabama, he entered the war as a private and later became a quarter-master in an Alabama regiment and later a paymaster of a cavalry unit (see the source below). Therefore, while both sides of Helen Keller's family fought for the Confederacy during the Civil War, Helen Keller's family on her mother's side was from the North and was related to the Adams family, a prominent family in Massachusetts.