Do your children a favor and get them a "real" computer with keyboard and mouse, instead of a tablet. I've found it helps with several things. For one, I've seen children accustomed to using touch interfaces blurring the line between physical and virtual, i.e swiping at physical objects like books, photos, even walls. I've not seen this behavior with those used to non touch interfaces. Also, learning to use a keyboar…
A friend of mine in college once wrote date on a sheet of paper during an exam, expecting to find out what time it was...