I'm watching my sister making out with 2 guys
What is your reason for spying on her?
Is that my dad? And who is that nerd?
You're invading your own sister's privacy. It's not right to spy on her to see who she's making out with.
First, this is not my father, Second, I think that nerd has high chance to be my brother since my sister is in her puberty phase.
Not really sure what you are talking about anymore. Either way, just think that everyone is entitled to their own privacy. For this reason, spying on any family member is not really a good thing to do.