Just watch the games with him on TV if you can't make it in person. If he looks up to you and sees you getting excited, he'll become even more interested. Take time to explain the rules of the game as it's going on so that he can pick up on them. My mom talks about my dad yelling "Where's the flag!?" while watching the Chiefs when I was three and I brought him a toy pirate flag from my room. haha...
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