<p>I think a keylogger is a really bad idea. Also a bad idea to contact a professor. </p>
<p>However, like others have said, I think it is fine to insist upon seeing past grades before agreeing to pay for the next semester’s expenses. It is reasonable to expect a certain level of performance to agree to continue paying. Better to discuss this with your son sooner rather than later, so that if there were problems last semester, you have some time to address them before school starts again in the fall.</p>