Give Them Some Space
As children grow (especially in their teenage years), it is important that they have their own space. Too much space, though, and they can quickly shut themselves off from their siblings. If your kids share a room, make sure there is also a part of the house where they can get a little privacy, like a reading nook in the office or a play tent in the living room. If your children have separate rooms, encourage a little family togetherness in a common area of the house (game night would be a perfect place to start).