According to the Illinois Statewide Marriage Index, which is online:
LOUGH, Nicholas - ROBERTSON, Sarah - 10/20/1891 - St. Clair County - License #000000852
BULLARD, General M - LOUGH, Sarah (Mrs.) - 10/5/1910 - Richland County - License #00000139
You may find marriages for all or some of the children on the website.You will also find instructions on how to order a copy of the marriage licenses on the website.
I'm "assuming" this is Martha:
MARVEL, Levi - ROBINSON, Martha - 5/2/1886 - Richland County - License # 00000054
The family is on the 1880 US Census, which is online free at www.familysearch.org(click on search for ancestors, click on census in the left-hand column of the page, select the 1880 US census from the drop down box):
Jason, age 44, born in KY, father born in VA, mother born in TN, farmer
Sarah M, age 40, born in KY, parents born in KY
Martha B, age 16, born in IL
John, age 15, born in IL
James P, age 12, born in IL
Noah M, age 9, born in IL
Taylor, age 6, born in IL
Charles, age 3, born in IL
District 174, Noble, Richland County, IL
In 1900, Sarah Lough and Noah Roberson are in Pixley Township, Clay County, IL.Sarah is a widow, widowed 2 years.11 children born/7 children living.
In 1900, Levi Marvel and Martha are in Noble Township, Richland County, IL.Levi born 6/1864, age 36, married 14 years, born in IL, father born in IN, mother born in IL, farmer, owns.Martha is born 4/1863, age 37.No children.
In 1910, Levi Marvel and his wife Martha are living in Noble Township, Richland County, IL.Living with them are Sarah Lowe (mother-in-law) and Noah Robinson (brother-in-law).Levi and Martha have no children.
In 1920, Levi Marvel and Martha are living in Noble Township, Richland County, IL.No children.
Also in Noble Township, Richland County, IL are Sarah Bullard, widow and Noah E Roberson.
Make sure you check all spelling variations when you check the marriage index.Roberson, Robertson, and Robinson.Apparently, Noah never married, unless he married after 1920.
I hope this helps a little.