Is Danny reacting to the "big fight" as if it's already happened? It seems like a thing the LW thinks would happen if they moved in with their grandparents in the actual letter, not a thing that's actually been realised (and also in the letter it's not clear whether the LW thinks it would be a fight between them and their dad, or between their grandparents and their dad, but I'd lean to the former while Danny seems to have gone with the latter)?