Hey Memory -- great post! I think that May and Fordogrim are going to get along famously!
One thing (and I'm sorry as this seems to be turning into a "correct Memory of Trees" thread, but this one is my fault since I didn't tell anybody that. . .)
You have May referring to Fordogrim as Grandfather Grim -- I have been using "Grim" as his sign off in the letters, but that is going to be his 'private' (and 'secret') name between he and Primrose: nobody else even knows that she used to call him that!
But who knows, if the relationship between May and Fordogrim gets even closer, perhaps he'll let her in on the name. . .
Thought just occured to me: perhaps Grandpa Fordo??