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I'm sorry to hear that it is very difficult for you. As a school, have you sent out learning packs to the children? If not, I would start with this but giving them lots of activities to be completed at home. With the lockdown in place, are you able to post them? Can they access emails? If so, email them a suggested list of taks.
https://learning-rooms.com/teaching-resources/whats-in-my-tray/