Donkey Kong Country Returns
Legend of Zelda: Twilight Princess
Legend of Zelda: Skyward Sword
New Super Mario Bros Wii
Punch-Out!!
Metroid Prime Trilogy
Super Mario Galaxy 1 & 2
Xenoblade Chronicles
Super Smash Bros Brawl
Mario Kart Wii

Hopefully that gives you a good starting list.

Here is a good list.

Metacritic top 25 Wii Games

Top 100 Wii Games

Between what I mentioned above and these two lists, that should be a good starting point.

Some are rated M, such as Resident Evil, so might be too young, but look up all the ESRB ratings, anything up to T I'd venture to say he's ready for, M and above, use your judgement.
Stephen Fry on "respect" and being "offended".
Calgon take me away.