He was the son of sea captain John Tucker Davis and his wife Letitia Ann George Davis. Alma Charles' parents were from Wales, and had joined the LDS (Mormon) Church in Liverpool, England in 1842.
Alma Charles married Margaret Ann Miller on 26 Jan 1874.

According to information from his daughter Margaret Davis Hansen, published in JAMES MILLER FAMILY HISTORY (1967), compiled and edited by Nell Creer Frame:
"Mother (Margaret Ann Miller) married Alma Charles Davis in the Endowment House at Salt Lake City, 26 January 1874. They lived in Spanish Fork which was one large community. Later it was divided into four wards, their home was in the First Ward. Father helped build the First Ward Church and was a counselor to the Bishop for a time. Mother was a counselor to Caroline Holt in the Relief Society.
"Alma Charles Davis, my father, was born June 6, 1848, in Liverpool, England, the son of John T. and Letitia Ann George Davis. At a young age he emigrated with his parents to America and arrived in Salt Lake City in 1852*. Alma Charles Davis and his family crossed the plains with the Captain Dan Jones Company**. The family lived in Salt Lake City for two years, then they moved to Spanish Fork, Utah, arriving there on Alma Charles Davis' sixth birthday. They lived in the Old Fort where the Alfred Beck home now stands.
"As a young boy he was industrious and also active in the church. He helped haul the logs from the canyon which were sawed into lumber to build the old Central Meeting House. This building was later remodeled and was called the "Opera House."
"At the age of eighteen, he was called to go to Sanpete to help guard the people there from the Indians who were robbing and killing them. He was in the Jonathan Page Company and was in the service for forty three days. After he had returned home, the Indians made a raid on Spanish Fork and drove away a herd of cows and work horses. He was then called to join a company of men and boys to overtake the Indians and return the cows and horses. When they caught up with the Indians a battle was held and several of the Indians were killed and one white man by the name of Albert Dimick. This was referred to as the "Diamond Creek Battle."
"After his service of protecting the people, he freighted a few years with mule teams. He freighted from American Fork, Utah to Pioche, Nevada. While on one of these trips his mother died, but travel was so slow he couldn't arrive in time for her funeral.
"Father and Mother had six children when Father was called to fill a mission to Great Britain, he served there two years. Mother was left to care for her six children, the oldest 13 and the youngest 2 years. Father rented his farm, but both years there was a shortage of irrigation water and very little crops were raised, but Mother being a good seamstress took in sewing and did very well earning money to send to Father and to help the family. While Father was on his mission the smaller children got the Scarlet Fever and the youngest boy John A. was left an invalid at 4 years old. He went to school part time and tried to do light work but was always in poor health. However, we were blessed in many ways, after a time my parents moved out on a farm a few miles from Spanish Fork. It was called a branch of the Second Ward. My father was made the presiding elder of the branch. We held all our meetings in the new school house which had just been erected. Father gave the land to the school board to build the school house one. Soon after they made that branch a ward naming it the Leland Ward, with Don C. Markham as Bishop and Father as First Counselor and John H. Koyle as second counselor. Mother worked as a counselor in the Relief Society for a time. We lived there for only five years and then moved back to Spanish Fork First Ward. They lived in the First Ward for a year or two and then bought another piece of land and moved back to Leland Ward. Soon they began to build a church house, Father was hauling rock and while in the canyon his team backed down a small hill crushing him against a ledge of rock breaking his ribs which pressed against his heart. This caused him a lot of trouble and after, about a year later, he took a stroke and died (1903). Mother was left with 10 children, two older children were married at the time. Mother did the best she knew how for her family.
"Their family was Letitia, Margaret, James M., Alma Charles, John Archibald, Mary Ellen, Howard Lewis, Jane Elizabeth, Ferrel Christina, Wilma, Vernon M., and Lily Berl. A few years before Father passed away John or Arch as we called him passed away, he was a fine boy and we all loved him so much. Mother sold the home and farm in Leland and bought a home in Spanish Fork Second Ward and owned it until she passed away. Two of the boys worked near Salt Lake and Wilma worked in Salt Lake, so Mother went to Salt Lake to make a home for them, soon afterwards the family was struck with the flu (1918). Mother had it very bad but survived it, but Farrell (Mrs. Amos Reece) died and left a three year old son, she died the night before Thanksgiving and Berl the youngest daughter of 16 died the night after Thanksgiving. Mother could not even see them or go to their funerals. In January her daughter Letitia (Mrs. John Lant) died and in April James M. the oldest son passed away, all four within five months. Mother then moved back to Spanish Fork where she could enjoy her neighbors and friends. She had an operation at the age of 70 and her health failed her after that; she died at the age of 78 years on April 9, 1934. She was a faithful Latter-day Saint and was loved and admired by all her family and friends, as was our loving father."

*they actually arrived in Utah in 1851.
**they actually traveled with Isaac Allred's Fifty, Easton Kelsey Company.