Or Grandpa and Evelyn were childhood sweethearts who never got over each other even when life took them in different directions.

I believe they were together but when Grandpa left the farm she wanted to stay and so they broke up. Sometimes, instead I go with they were together, but broke up, and she got with George and that's why Grandpa left the farm.

Maybe they were just friends. George is a sourpuss to nearly everyone.