How to reset a kid's forgotten phone lock-screen password?
Download find my device and make it device administrator(which is enabled by default i think..).. And if the kid changes password then you can reset it from the find my device website using your laptop.. Just ensure that the phone has internet connection while trying to reset it..
WEBSITE
APP
DON'T FORGET TO DO A TEST RUN..
If anything goes wrong just comment here.. I'll help