1. No matter what he says about supporting your team of choice, he will try to convert you. Gently remind him by putting a DI box in the garage for Ute-branded items you get as gifts.
2. Expect a living room full of Ute fans for every away game, since not all of them can afford the Pac12 Network and your 70-inch tv.
3. To maintain the peace, when you have kids, indoctrinate them Ute, Cougar, Ute, Cougar, etc.
4. Hold your tongue about anything negative about Utah, even if he claims that Kyle sucks and the team has no energy. Never, ever agree with him-- it will not go well for you. Instead go on Cougarboard and vent your spleen there.
5. Every year before the Holy War, you will get a call from a SL Trib reporter asking to do a story on your divided family. I am not kidding. Don't do it.