The children are four and five.<p>Who is monitoring them while they are playing video games?<p>It's reasonably easy to calm children down when you need to, you just need to learn some techniques. These techniques would probably require someone to be in the room for them to work, but once you've succeeded in calming down the over-boisterous behaviour they'd be okay.<p>And, of course, children enjoy being boisterous, so I hope they get opportunities to let off steam in a more appropriate setting. Soft play rooms[1] are good, as are parks and gardens and some games in the home.<p>The adult could investigate various parenting courses. "Webster Stratton" is an example of a respected course.<p>[1] In the UK you might have a Sure Start centre near you with a soft play room for hire. These are lovely because you will be in the room with your child alone, and you can really enjoy the experience. There are also commercial providers such as Play Barn which will be full of screaming, crying, poorly supervised children and stressed harried parents. This is, for some people, a hellish experience.