1900 Census of Wetaug, Pulaski Co IL
Name                        	AgeAlfred E Heathcock    	25          m 4 yrs
Amanda E Heathcock	23          m 4 yrs; mother of 2, both living
Edith M Heathcock     	  3            dau
Gertrude Heathcock  	    11/12  dau
Emma Lee Dooney    	  5            boarder
Lizzie B Evans           	15            servant
1910 Census of Cario Ward 5, Alexander Co IL
Name                         	AgeAlfa Heathcock            	36           head  place of birth: United States (also father and mother)
Ravinia Heathcock        	33           wife  (indicates 3 in column “number of years in present marriage)
Edith Heathcock           	13           dau
Gertrude Heathcock     	11           dau
Earl Heathcock           	  9           son
Lawerance Burke           	  5           step-son
James Heathcock         	  1           son
This census indicates that Ravinia (Lavinia in later census records and family tradition) was mother of James Heathcock.  Also, it suggests that Ravinia was first married to a Burke.
Alfred Earl Heathcock filled out a WWI draft registration form on 12 Sep 1918.
26  At the time he was a barber and lived at 327 28th St. in Cairo IL.  He reported his nearest relative to be Clara Heathcock.  He was reported to be medium height, meidum build, with blue eyes and light hair.
 
I still can't find Alfred Earl in 1920 but I found Clara listed with her mother in Cairo IL:
Name                	Age
Harriet Simpson	63	head 		widow	keeper of a rooming house
Clara Heathcock	43	dau   		married	b Kentucky, parents both born Kentucky
Willa May Winn     	23	grand-dau	single
Rollo J Halle      	23	boarder
Treva Halle          	23	boarder
Katherine Halle 	  2	boarder
Note that it says Clara is "married" not "widow" like her mother.  This tells me that Alfred Earl was still around somewhere but not yet found in the census.  Willa May Winn was presumably Clara's daughter by her first marriage.