Next time Brighton are in the tv try and get them to watch the game with you, if they are interested and enjoy it, take them to a game, if they arent interested then wait.
Not the same as being there but will at least give you an idea if they will watch a whole game.
Bring lots of money!!!
Take them to where you will be sitting whilst the ground is relatively empty, it's a lot less intimidating when the seats are mostly empty.
Dont be too down hearted if they aren't overly interested, it's a long time for young kids to retain interest.
I suggest you bring...