Thanks for the update, clarification.
Thomas D And Marcha according to census records both US and Kansas state census found on ancestry.com
1870 Ill census Name Coskill same as father
Thomas
Maria
Nellie 1
Mary 1

1880 Census Union Kansas
Thomas
Marcha
Nellie 11
Della 11
Edward 8
Charles Elmer 5
Thomas Robert 2

1895 Kansas State census
Thomas
Marcha
Edward 23
Charles E 19
Robert 16
Bessie 12

1900 US census
Thomas
Marcha (census record # of preganancies and # of living children she said 6-6)
Edward
Charles
Robert
Bessie

1910 US census
Thomas
Marcha SHe stated 6 children born and living
Charles
Robert

I was able to follow the boys via censuses and find a grave. Unable to find anything about the girls whether they died young or married.
Hope this extra bit of info helps
you can contact me off the board if you would like crgri870 at aol dot com.
Carol G