I have a 4 year old son who has a tendency of throwing things around or slamming them on the floor when he gets too excited, but I still let him play with my Legos anyway. Luckily, most Lego sets don't really get damaged or destroyed when this happens and they just come apart. I always find myself piecing back my sets together though lol. I just make sure to watch him play with my sets because if ever he tosses a set around, pieces might go flying over and lost under carpets or couches. If you wanna read more about Lego with your kids check out this article by The Toy Report to educate them a little more about Lego, it's a quick and easy read for you and your kid!