Could this simply be because schools were closed? If there is no child 2 child interaction, there cannot be an infection via this vector. Lockdown effectively

Could this simply be because schools were closed? If there is no child 2 child interaction, there cannot be an infection via this vector. 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.