Don't tell Isaac that if he's upset Ethan will come cause that is a sure fire way of making him upset to get Ethan! We always say to mums never tell them if you feel sick tell the teacher and she will get mum to pick you up cause then they do it LOL Just tell him that Ethan is at the school and he loves it etc.
Our school has all the school together in the playground as we only have 375 kids.