Don't scold your kids, or that could lead to depression, which is hard to overcome. Instead, create a play room even if you only have a few toys (I recommend placing it on one of the front patio rooms). When you see them doing something bad, quickly move them to the toy room. Then praise them, which is teaching them a positive lesson instead of potentially causing depression. If a thing comes up that says stop nagging, don't praise but still drag them to the toy room. If they resist too often, block off the toy room with a couch or bed to keep them in. Hope that make them more well behaved, because it worked with my kids!