Well, the reason I asked is that if the machine runs under that
administrator account whatever is installed or changed can be undone. The
only way I can see anything lasting is for Mom to set something up as
administrator and give son his own limited account. With some software that
can be a real pain if you are not 100% sure what you are doing. Of course
son must not know admin password.
There's nothing built in that will do this, but you see my point if software
is employed, there will be a need for some learning and setting up.
Charlie