Depending on the age and how computer savvy your son is, you could just make the folder containing the files hidden. A better solution, especially if he is pretty computer savvy, is to set up two accounts. One user account for yourself with your folder as being only read and write accessible by your account, and one for him where he won't have access to that folder.
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"Fuck these chains
No goddamn slave
I will be different" ~ Machine Head
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