Ancestors of Mark David Ryerson

                     /--Frank Leroy Ryerson  b. 5 OCT 1894 at 
             /--Kent Piercy Ryerson  b. 26 AUG 1925 at Burt, IA
             |       |       /--Leroy Swampstead McWhorter  b. 19 JAN 1870 at   d. 21 FEB 1945
             |       \--Rowena Barrett McWhorter  b. 15 OCT 1896 at Burt, IA  d. 6 AUG 1976
             |               \--Mary Ethel Barrett  b. 18 SEP 1870 at   d. 25 JUN 1932 =>
Mark David Ryerson
             \--Grace Agnes Lechner  b. 10 JAN 1925 at