Point is:

he should not need to silently email

if he really wants to know who, at least
email (but also I do believe keylog) should
be useless

if he really needs to take a glance at
people in his house, he should use a webcam
(and get denounced for that)

if the Pc is in his home, and it is really his
own Pc, and who is not so important, but it
is what, he could take a look at logs at night
(and get a slap for that; but if he is trying to
grab credit card, username and pwd of his
grandpa, he should be in bigger trouble...)