Gaming Community, Help! Need husband & wife games?

Me and the wife have a Wii & a older xbox(used as XboxMEdiaCenter, but still plays games).

We really enjoyed playing together Kirby Dreamland, we had a few hard spots but used the internet to help us though. We enjoyed Mario World, but half way through it had so many trick moves required we become frustrated and quit. Donkey Kong Returns was the same way, half way thru it just became to hard for us. Ive tried a few other games but nothing was as fun as the co-op Kirby game. Between the 2 units can you think of any games for us to try that was simple,silly,fun, and co-op like the kirby dreamland game?? I have a Wii & older Xbox. We do like playing the tennis, but that bores out very quick. We are early 40's, so were not crazy about stuff that gets stupid hard after 3-4 levels, but do expect stuff to get harder as we learn new moves,and can always go to youtube for help with levels(im the techy,so...). Tried the lego games also, she didnt care for them, wii doesnt explain the controls and abilitys like i remember it did in xbox360 and such at friends houses, bottom line, she was crazy about it.

thanks guys

hope you can help..

Chuck