Yes everyone in the room has to be on it. Our picky 5 year old is on it but the 2 year old is not because he is under 3. Our plan is to order OOP for the 5 year old and give the kids DP meal to the 2 year old who eats everything and eats alot! I assume this will not be a problem. We'll just switch the plates when the meal comes to the table.