Just looking again at the records with an eye toward that bit about Elbert's parents possibly being Luke and Caroline Melton.
The 1870 record in Falls is for Lucas (indexed as "Lenar") and Caroline Milton, son Albert age 14.
1910 shows 79 year old widow Caroline in Rosebud with daughter Luvina and 3 granddaughters. Also a boarder named Virginia Washington; perhaps another relative of Rosa. This suggests a hunt for an obituary and possibly old church records.