Welcome to the forum.
First of which Wii system version are you using?
There is a parental lock on the Wii in Settings I'm not sure what it locks. Kids will be kids and thy will find their way around anything or know friends who can.
You will have to explain to them that your going to softmod the Wii so they can play loads of games of an external drive. Don't do any changes to it apart from playing the games. If they makes changes and it becomes unusable then they have lost it and have to save up or do chores for another one.
They probably won't listen to you but as your softmodding via the tutorials on here and you must do a NAND backup if they do brick it you can restore it.
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