Red vs. Green

So we have a family fued going with tractors. I like green John Deeres and Cowboy likes the red ones. So we have each been trying to get Paige to recognize the appropriate brand. I am winning so far. She sees any tractor, baler, implement, etc. and yells "John Deere!" (My dad is so proud of this.) Cowboy thinks we are ambushing him with this, so he's been telling her "Case" when we see the tractor in our yard. She then obediently repeats it for him and he grins. I tolerate this since I know when she sees it later on, that she yells "Red John Deere!" I haven't had the heart to tell him this yet.