Kids can catch and transmit the virus to other household members; this was the main path through the community in a few flu models a while back (spread through daycare and the elementary schools first, then families, then everyone else).

Household transmission rate was about 15% in china. (so a 15% chance of infecting another member of your household).

https://www.medrxiv.org/content/10.1101/2020.03.03.20028423v...