This is a great website with loads of activities and ideas, and lesson ideas for parents with fantastic plans for numeracy, literacy, even subjects like geography built around the concept of healthy eating. There are also good recipes to try. It also gives parents ideas on how to structure their day in terms of setting routines and planning learning. There are also resources and support for teachers.
Another good one is parent club. This has information on healthy diet, as well as information on how to navigate the tricky waters of lockdown with children!