more like, now he knows his son has been hanging out with her
But didn't he already suspect such a thing? Since he heard his voice on her phone or something like that (I have a bad memory)
no. he never spoke when he called her phone. the dad answered with a hello that's how he suspected that the dad was closing in. the dad never knew that his son was friends with her. that's why the son was able to lie for awhile whenever the dad asked if his son found her.
Ohhhh now I remember, indeed.
Now his father knows he wanted to try to change her look. D: