Alvin and Mary had four children, born in 1918, 1919, 1922, and the last in 1924. The youngest died in 1998.317

1920 Census, Clay Dist., Ritchie Co., WV, Feb. 2:
Cooper, Alvin M., head, 27, b. WV, parents b. WV, salesman, department store
Mary C., wife, 21, b. WV, parents b. WV
Theda, dau., 1y 10m., b. WV
Lowell M., son, 2m, b. WV

1930 Census, Vienna, Williams Dist., Wood Co., WV
Cooper, Alvin H., head, own home, $3000, 37, married at age 25, b. WV, parents b. WV, salesman, automobile
Mary C., wife, 31, married at age 20, b. WV, father b. ?, mother b. WV
Theda, dau., 12, b. WV
Lowell M. L., son, 10, b. WV
Newell, son, 8, b. WV
Lemon, Daisy, sister-in-law, 20, b. WV, parents b. WV, sorter, ?
Cooper, Louise, dau., 5, b. WV