What do you mean ‘what if they touched me’, did they?
I assume you’re over 18? So of course they can interview you alone, you’re an adult. And yes, they can search your phone.
As @Boiler said, it sounds like you’ve been working when you shouldn’t have been. You can’t do freelance work on a tourist visa, no matter where your clients are.
All you can do now is leave well before your period of authorised stay, and then stay out a longer time before trying to return. And don’t do any work whilst you’re there!
And you say your Dad isn’t planning on settling in the US for ‘a year or so’. Does he have a re-entry permit? If not he should get one, his own status is at risk by staying outside of the US for so long, and now that will be on his record too so he should expect more scrutiny if he leaves again. When did they get their green cards?