You'll likely find Wii versions of popular FPS games a bit "watered down," especially in terms of graphics. However, there is some advantages to the control system.
For example, I really enjoyed the controls on Tomb Raider Anniversary, because you can control Lara with one hand, and shoot by pointing at the screen with the other. Since I'm a PC player, I'm used to pointing and clicking to shoot, rather than moving a cursor around with a directional pad. Various shooting games on the Wii should be similar, just don't expect the wow factor of Xbox 360 and PS3 in terms of graphics.
I do highly recommend the "classic controller" for Wii. It's similar to the Nintendo Game Cube controller I think. It has the same button set up as some Playstation controllers I've used at least. This type of controller is great for your classic style games such as platformers, fighters, and racers.
If you're into FPS, I don't have much to recommend on the Wii, as I haven't played many of that type on it. It's not really the system's strong point. Though the one game that did really well was Metroid Prime 3: Corruption. That game itself should be a good introducton to what can be done on the system in terms of FPS and the Wii Remote. I see they also recently released Metroid Prime Trilogy, which is getting great reviews.
Other than that, Call of Duty: World at War and Modern Warfare received decent reviews, but they didn't "port" to the Wii well enough to compare to the other systems, again in terms of graphics.
Once you get the system, you will find that the Wii's strength is in a number of other types of gameplay outside of FPS. If you're a huge FPS gamer, you might be disappointed unless you enjoy other types of games.
As for the kids, it's the system I'd recommend the most. There is a slew of games that they'll absolutely love.
There are many genres of games to explore on the system. I recommend going to Metacritic.com to see what critics are saying about the top Wii games and maybe consider trying some of them out to see what the system is good for.
Good luck.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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