HAHA good one.
I was really looking for a game for my little bro more than for me. Don't worry I have seen much worst.

Ah

(Well, another suggestion I can throw out is to
avoid Quake 4. It has a bit of a gruesome scene around half way through... Lets just say that you get chopped into little pieces... and have to watch the whole thing

)
If you're family doesn't mind "Pay to Play" games, the only true MMOFPS in existence is Planetside!
It costs about $15 a month to play (this may have been lowered), but you can literally have battles over a single base, consisting of 300+ players... per team. There's three teams, known as Empires, rampaging around the game-world at a time. Many different areas to play on, with varying terrain (Searhus, for example is a giant Volcano, Ceryshen is filled with Icy Canyons, Ishunder is mostly desert, etc).
Lots of different weapons and vehicles, including air vehicles for transport, bombing, and aerial fighting. Tanks, tanks, and more tanks, along with ATV's for faster transport. I've been playing the game since it was released, and I'm not even close to bored with it!
www.planetside.comhttp://en.wikipedia.org/wiki/Planetside
4GB DDR2 PC5300; 3.2GHz Pentium D 940, Nvidia 9800GT 1024MB DDR3, Windows XP Pro SP3