Son of John of Drumfalda "Red John" and Elizabeth [nee Tatlow] Jackson.
Red John was born 1791, Ireland and died 1839, Athens, Limestone Co.,, Al.

Elizabeth was born 4 July 1792, Ireland and died 2 June 1824, Tullycorbett, Ireland.
Red John and children Emigration was in 1829 from County Monaghan, Ireland.

Born 7 Nov. 1823, Drumfaldra, County Monaghan, Ireland,
died 11 July 1889 Austin, Travis co., Tx. married 4 April 1849

Courtesy of Find A Grave contributor Donna Lee Wall

Major Jackson served as an Assistant Adjutant General during Sibley's New Mexico Campaign of 1862. He established temporary Headquarters at Santa Fe with a small force.

Courtesy of Find A Grave contributor Charles Walthall

Alexander Melvorne Jackson, the son of John Jackson, a Scotch-Irish linen merchant, was born at Drumfaldra near Bally Bay, County Monaghan, Ireland, on November 7, 1823. His family emigrated to the United States in 1829 and settled near Athens, Alabama. After his father's death in 1839, Alexander worked as a clerk in Memphis, Tennessee for a short period of time. At the invitation of his stepmother, Alicia Jackson, he went to Marietta, Ohio in 1840 where he received most of his education from private tutors. There he began the study of law under judge Arius Nye. In 1842 he moved to Holly Springs, Mississippi and completed his legal studies under his brother-in-law, Colonel Thomas J. Word. Three years later he was admitted to the Mississippi Bar Association and entered into the practice of law with Judge Nathaniel S. Price of Ripley, Mississippi. In addition, he assisted Judge Price with the editing of the Ripley Advertiser.
At the outset of the Mexican War, in 1846, Jackson joined the 2nd Regiment of Mississippi Volunteers, under the command of Colonel Reuben Davis, and served as Captain of Company E. After the War he returned to Ripley and resumed the practice of law. On April 4, 1849 he married Miss Cordelia C. Kavanaugh, daughter of Dr. W.W. Kavanaugh.
During the 1850's Jackson became involved in politics. In 1852 he was appointed special district attorney in Oxford, Mississippi and served as an elector for the district Democratic convention and later as a member of the State Democratic Central Committee. Then in 1857 he made a bid for the Democratic nomination to the United States House of Representatives. At the convention, Jackson Was deadlocked with J.W. Clapp and J. F. Cushman through 59 ballots. Finally, their names were withdrawn and L. Q. C. Lamar was nominated by acclamation on the sixtieth ballot.
In September of that year Jackson was appointed by President Buchanan as Secretary of the New Mexico Territory. At the outbreak of the Civil War he resigned and joined the Confederate Army. He Served as Adjutant-General of the Sibley Brigade and participated in the New Mexico and Arizona campaign. His health became poor, so in 1864 President Davis appointed him Chief Justice of Arizona. Jackson never assumed that post since the Confederacy lost control of the Territory.
At the close of the War, Jackson settled in Austin, Texas where he formed a law practice with Charles L. Robards and held various positions in the bar. When the Texas Court of Appeals was organized in 1876, he was appointed the Court Reporter. He held that position until his death on July 11, 1889. His wife, Cordelia, preceded him in death by four years. They had three daughters, Clara, Stella, Florence, and two sons, Nat and Alexander Jr. Alexander Jr. succeeded his father as Court Reporter for the Texas Court of Appeals.
Source: The University of Southern Mississippi -- McCain Library and Archives

Courtesy of Find A Grave contributor Charles Walthall