Luckygirl and Maybee I don't have grandchildren, but if I did, I wouldn't go near them until we know how the situation works out and then I'd weigh up the risks. I did see one of the John Campbell videos about children. I've also watched the Independent Sage videos and read the DELVE report.
There are over 8 million school children who are due to go back to school in September. Up to now, they've been in limited circulation. Yes, I know some of them have been mixing, but not in groups of 30 cooped up together for five hours without social distancing in poorly ventilated rooms. Those are precisely the conditions people are told to avoid.
The test and track system is still not working efficiently, so there could be widespread transmission before anybody is even aware.
We just have no experience or accurate data on what will happen. It would be absolutely fantastic if transmission rates don't rise, but there are no guarantees.