The marriage certificate will have signatures, or "mark", it will have witnesses names, suggestion of religious association if married in a church.
Cause of death is cirrhosis of the liver, often associated with excess alcohol use.
Can you scan and show here the three death certificates that you have previously transcribed. Presentation of the information can be just as useful as the substance of the information.
Do you have birth places for the two sons and three daughters who are counted on the death certificates of George and Annie. Are you descended from one of these five children?
Just to clarify - you need to find out who is buried with George and Annie.
And if Lena is not buried with them, locate her plot....and ask who else is buried there.