I did some further research and can add the following. Thomas D the son did serve in both the 15th Ill and the 134th Ill documentation CIvil War Pension record seen on Ancestry .com.
1870 Census Goodale Ill
Thomas 56
Mary 54
Margaret 23
John 19
James 17
Maria 15
Maria 14
Carrie 3
Eugene 1
Who are Maria age 14, Carrie and Eugene? Since no relationships are given hard to know. ? child of thomas and Mary ? grand children

In the records I was able to view Thomas the father did not use the initial D but the son did.
Thomas D and Marcha had 6 children all found in the census with the family. Marcha was found in the 1930 census age 80 widow so she died b/w 1930 -1940

George the find a grave memorial for Thomas bur Ostend cem states that he served in the civil war. You might want to edit the memorial for accuracy.
Carol G