Make It a Game
Make a game of de-cluttering your home. Take a large black dustbin bag and ruthlessly edit the contents of each room. if it has not been used for 6 months, bin it, if it has not been worn for 12 months, bin it.
Encourage the children to do the same with their rooms, giving them 15 minutes to complete their task, with the promise of a small reward (bribe) if necessary.
Happy decluttering.