Like Wolf said- hard to say without knowing ages of kids. But this might work for you with little ones: Try to have them stay in the dining room, or general area where you’re having the meal, instead of trying to keep them sitting in their seats. You can decide when they can leave the table- after Kiddush, after Hamotzi, after the 1st course… Playing in a corner is ok, as long as they’re in the vicinity of your table. That way they can join in the zemiros, the conversation, the meal, as they wish, and not get bored & fidgety. You”ll be able to relax (hopefully) instead of interrupting yourself every two minutes to get them to sit still. The kids will absorb more than you think from the general festive atmosphere, and not feel grumpy and put upon.
Menu