I think my dad thinks I was peeping on my little sister
Does he have any evidence to make him think youwere doing that?
No. I was just staring at her while I was on my phone.
While your dad might have thought he saw something he didn't it is understandable that you would be angry and upset at an accusation of peeping at your own sister. If your dad confronts you, it would be best to calmly explain the situation and not get defensive.
Maybe if I tell him the truth, he'll stop bothering me.
You should tell him the truth so there are no misunderstandings. You should be upset that he even thought that.