This is a very touchy subject on many levels. I've taken my son every where with me since he was little and he's always been very well behaved but some places/restaurants are not appropriate. I think it's asking a lot of a 3 & 5 year old to sit through dinner at Narcosse's. Some venues lend themselves to bringing items to entertain children, an upscale dining establishement in my opinion is not one.
I love Jiko, I had the unfortunate experience of dining at Jiko with "Tyler" and his parents last June. Tyler, all of 3 years old, was not in our party but he frequently rolled on the floor by my feet with his mother constantly asking him to come sit, to color, to be quiet. This went on for well over an hour.
Needless to say we didn't have a relaxed nor enjoyable dinner, nor did Tyler enjoy his dinner, but his Mother and Dad seem to. At 9pm, Jimmy, after a full day at the park, really needed to be in bed, not dinind at Jiko. I truly felt bad for him, he shouldn't have been put into this situation. Tyler's parents in my opinion, should have asked for a doggy bag when things started to fall apart and leave the restaurant, if not for the sake of the other diners but at least for Tyler.
If you truly want a special intimate dining experience at Narcosse's, which I love by the way, perhaps a sitter is a better option for every one concerned.