If they are your Kids, you should regulate them of using too much computers and stuff. Always remind them that school education comes first before anything else, we are now in a digital age. Smartphones and new computer designs comes every year so, its nearly impossible to stop them getting hook on those things, let them play but make sure they dont forget their responsibilities as a student for them to have a brighter future. Always give them advice about the consequences of too much using and playing computer games.
And lastly, give them suggestions like focusing on other things such as sports or give them books to read.