I know this is an old thread, but I'd like to share a bit from an article in the january issue of Premier Guitar:
"Gentle readers, if any of you have or soon will have children, here's an exercise that will make life far better for you and your offspring. In honor of your child:
1 - Take your two most valuable instruments of of their cases.
2 - Hold an instrument in each hand in front of you, parallel to your body.
3 - Smack them together hard enough to do some damage - at least a paint ding.
4 - Turn the instruments around and repeat.
Well done. Now you are ready to play music with your child."
The article goes on to say that, if I may paraphrase, you have two choices:
1 - let the kids have access to the guitars and accept the occasional ding.
-or -
2 - deny them access and then they'll put the occasional ding in them anyway, to which you will no doubt freak out about.
Going with 1 you'll have a kid who is into music, bonds with you, and (eventually) respects instruments.
Going with 2 and you'll have a kid who plays your guitars behind your back and thinks you're an uptight dick.
so far #1 is working for me