We have a sign in our rig: "Pets are welcome; children must be leashed". As you can guess, we can tell we no longer have our children with us when we travel.
But do your children do that at home too? Seems to me some discipline is called for. And what about the knobs on the gas stove, electrical switches, power cords, etc.? ??? Well, I guess that's your business and not mine.
Are they removing the curtain from the rod of the rod from the brackets? Not all standard curtain rods are removable without tools. The typical draw types usually have a lock device or a screw holding the rod to the bracket, so kids probably won't be able to easily remove it. But if you have the cafe-type rod that simply slides through a pocket in the curtain, then you would probably have to replace the curtains with another type to use a draw rod..