I believe these are the death records for your great grandparents. if you don't have this it may provide other possibilities to search.
name: Christ Ernest Moerlien
death date: 11 Feb 1937
death place: Granite City, Madison, Illinois
gender: Male
age: 82
estimated birth year: 1855
birth date: 13 Feb 1854
birthplace: Germany
father:
father's titles and terms (original):
father's birth place: Germany
mother:
mother's titles and terms (original):
mother's birth place: Germany
occupation: Farmer
residence: Irondale, Washington, Mo.
spouse: Menna Moerlien
spouse's titles and terms (original):
spouse's birthplace:
burial date: 14 Feb 1937
burial place: Granite City, Madison, Ill.
name: Minnie Moerlien
titles and terms (original):
death date: 24 Feb 1929
death place: Granite City, Madison, Illinois
gender: Female
marital status:
race or color:
age: 62
estimated birth year: 1867
birth date: 18 Sep 1866
birthplace: Nameoki, Ill.
father: Frederick Wehrman
father's titles and terms (original):
father's birth place: Germany
mother:
mother's titles and terms (original):
mother's birth place: Germany
occupation: Housewife
residence: Granite City, Madison, Illinois
street address:
spouse: Christ... Moerlien
spouse's titles and terms (original):
spouse's birthplace:
burial date: 26 Feb 1929
burial place: Granite City, Madison, Ill.
cemetery: