Of course you want to know what is going on in the lives of your kids – they are your kids after all. If you can do anything, I am sure you will grab the first chance if you want to protect your kids and monitor them.
Sadly, you cannot always do that now because you are working but here is an effective method to do that. Get an IDEN spyware and install it on the mobile phones of your kids. It will track all activities that are coming and going their lines as well as monitor the deleted files.