Student rental housemate problem

[Carlos Lez]

Dear forumites,

I have a house that I rent by rooms to university student. I received an email from one of the housemates

"I'd like to meet you. My roommate has made me uncomfortable living here because of things he has posted on the internet about me, including a recording of me without my knowledge. Thank you for your time."

She is a freshman and alluding to a graduate male student who is in his 3rd year living at the property with no problems so far. Her dad has also called and left a message that she is experiencing this and needs to talk to her. It doesn't appear that the motivation is to break the lease because she seems to get along with the 2 other female housemates.

I am not sure as to how to even approach answering this? I would greatly appreciate if I someone can provide advise on how to address this situation.

Thanks in advance.