To keep the organizing going, and the clutter at bay, every item needs to go back to its home. for a residential organizing project, next to purging and/or downsizing, much of the work is in establishing a home for everything in your home. Once an item has a home, it needs to return there when you finish using/playing with it.
Again, just a few minutes a day to scan through your home and put things away will take you a long way to a more organized existence. Teach your children from an early age to cruise through the house before bed and put away their toys/homework/books/video games. Assign them a time limit. Keep it simple and commit to completing this task daily.