All kids live with adults, and they get high exposure to the virus when their family gets infected. From this we know that kids have a low mortality rate.
And the grand parents and obese parents are vulnerable as all merry hell.
In Iceland, they did extensive testing, and genetic tracing of infections.
Children infecting other children was extremely rare. In almost all cases, it was adults infecting them.
There was only a SINGLE case of a child infecting an adult.
https://www.sciencemuseumgroup.org.uk/blog/hunting-down-covi...
Lockdown effectively places every family into its own bubble. Family members can only get infected by someone interaction with the outside world. If the kids stay home and only the adults interact with the outside world, than we would expect to see basically zero child 2 child infections.
https://www.google.com/amp/s/www.nytimes.com/2020/07/18/heal...