From those suggestions boom blox,zack&wiki,de blob and mario strikers look like the best ones. Any more suggestions?
@Khuutra
No, I don't want to hear them play wii music for few days. I have my limits! Also I don't know what dragonball is.
@Roma
They are quite bright kids, I would actually prefer a game which can be challanging.
edit:
Is zack&wiki really that difficult? I don't know much about it, but how is it compared to old games like king's quest?