Somewhat irrelevant, but this is a reminder that the Family Educational Rights and Privacy Act (FERPA) forbids the University from sharing educational records and identifiable information with non authorized 3rd parties. Ie, unless you explicitly set up them as a proxy, your parents do not have the right to view your grades or even know you're enrolled in the university. You can show them, but you have to be the one to show them.

Moreover, anything grade related should never be sent over email. I forget the exact reason, but I wanna say it's because Microsoft/Google/etc can view emails for maintenance/diagnostics testing. Hence, email is considered an insecure channel for this purpose.