Seems like the children either eat what you prepare, and buy or they will be hungry. Don’t worrie, they won’t starve. They’ll come around so long as you remember you are the parent, not them. I had 7 children, not a picky one ever but it was never tolerated. If they would not eat their meal when it was served it went in frig and put before them the next meal, cold. They were not allowed to eat anything else until they ate the good wholesome meal that had been prepared. Usually took only twice and they soon saw fresh and hot and tasty was far better than cold and left over. Today, many years later they have all thanked me for not allowing pickiness. Told them Mom is not a restaurant.