Hi there, what kind of budget do you have? Inventions character buffet inside the Disneyland Hotel is pretty special but for 2 adults and 3 kids it would be about €250 so serious money.
Cafe Mickey is also great with lots of characters coming round the tables and that would be about €150 for a family of 5. If you go to a character meal, and your kids want to collect autographs, this is the perfect opportunity to do that and is much better than queuing to meet them in the parks so remember to take autograph books and a pen with you or get one from a shop in Disney village beforehand.
Another option is the Rainforest Cafe which is meant to be nice but I've never been there personally so I can't say.