Info provided by FAG member:

He married Barbara Johnson 15 Feb 1833. Barbara b. 15 May 1816 Jackson Co TN, d. 17 Apr 1849, Marengo, Jackson Co, TN.
They had at least 6 children.

After her death, he married Amanda F Maxwell (b. 22 Dec 1826, d. 16 Mar 1907. They married in Jackson County TN 31 Jul 1849
They had 10 children.

His obit:

http://www.tngenes.net/obituaries/tcp/mnames.html
The Cookeville Press 1894-1899
MORGAN, AUSTIN HAWKINS: Memorial Sketch. Austing Hawkins Morgan was born Oct. 15, 1813, and departed this life at his home, at Marengo, Jackson county, Tenn., May 18, 1898, at 8 o'clock p.m. He had lived on Roaring river, at the place of his demise, for a period of over sixty years. Deceased was the last of the sons of Job Morgan, Esq., of Spring creek, who died several years ago at an advanced age. Of his father's family there were five sons and four daughter who reached the years of maturity. Of the sons Joseph was the oldest. He was a soldier in the war of 1812, and after going safely through the battle of New Orleans with Gen. Jackson, died of measles at Natchez, Miss., before reaching home. The others, Lloyd, Carroll, Daniel and Henley, all have passed to their reward. The daughters, Nancy Hampton, Elizabeth Mahaney, Polly Loftis and Sallie Gibbons have all likewise crossed over the river of death save the last named only, who survives at a ripe old age at Grand Prairie, Missouri. The subject of this sketch was first married to Barbara Johnson, of which union five children were born, four of whom are yet living. After his first wife's death he married Amanda F. Maxwell, of Putnam county, who survives him. Of this last marriage ten children were born, seven of whom are still living. Four of his children are residents of Cookeville. He filled several civic positions of trust, among others, Justice of the Peace and Trustee of his county, and one of the Commissioners that laid off Cookeville, being the last surviyor. (sic) As a minister in the Cumberland Presbyterian church, none in the bounds of the Sparta Presbytery, wield a wider influence, he having occupied the pulpit for near a half century. He was made a Mason soon after the late war, being a member of Tannhill Lodge, No. 133, and Gainesboro Chapter, No. 86, serving for years as Chaplain of both bodies. Upon his request he secured the establishment of Marengo postoffice, over 40 years ago, and was continuously postmaster there until a a few weeks since when he wrote to the department that he had served the Government in that capacity 42 years and had become to feeble to attend to the office and asked to have his son appointed in his stead, and it was promptly done. A vast concourse attended his funeral at Overton burying ground on the 20th inst. After impressive religious services, conducted by Brothers S. K. Phillips and W. M. Swearengin, ministers of his church, his remains were buried with Masonic rites by Tannahill Lodge, assisted by members of the order from Livingston and Cookeville. In accordance with his request, repeatedly made, the Masonic funeral ceremonies were conducted by his newphew, Past Grand Master, George H. Morgan of Cookeville. By his death the community has lost a man distinguished for good deeds in his day and generation Generous, kind, charitable, and of the highest order of integrity. He was respected by all who knew him. While to fill faithfully his sacred calling was his chief aim in life, he nevertheless took an active interest in public affairs and no man wielded a greater influence than he did in whatever pertained to the welfare of the community, either socially, politically or religiously. With his intellect undimmed by the flight of years, having lived four score and nearly five, attended by his loving wife, all of his living children but one and a large circle of neighbors and friends, his lamp of life went quietly out and his pure spirit was wafted to the eternal home where God and the angels dwell. Among his last audible words was a quotation from a favorite Psalm of David: "Yea, though I walk through the valley of the shadow of death, I will fear no evil for thou are with me." Having breathed these comforting words of inspiration his soul and body separated and all that is left for his loved ones who linger behind is the bright example of a pious and hole life to direct them to a higher and nobler state of existence. May this sweet benison be accepted by them as a precious heritage and lead them all to walk in his footsteps with the son of righteousness as their guiding star. [Date: 6/2/1895, Vol. XI, No. 33, Page 1]