I may have found your Allen family. In 1900 Colbert Co. Al is a William D. Allen with several children including Cora, Roscoe, Paul & Arthur. He is Inspector for RR. Do you have access to the Census Records ? If so William D's Parents are on the 1860 Franklin CO AL and by 1870 his mother is widow with 3 children still at home, including William in Colbert Co. If you don't have access to Census I will be glad to send you this information. Also if you think this is the right one I can look for other information.