I think my dad was looking up porn?

Ok so me and my mom were up in her room watching One Life To Live when I went downstairs to grab my phone. As I came down the stairs I saw my dad laying on the couch looking at my brothers laptop. I couldn't see the screen but I could hear a women moaning and making noises like "Uh Uh!" My dad asked what I wanted suddenly but I could tell he was trying to keep cool. I said I was grabbing my phone. Once I got upstairs I went to my room and got on my laptop. I looked up "I caught my dad watching porn?" and stuff like that but one of the answers said to talk it over with a sibling. I walked down the hall to my brother Marc's room. After I told him the story he told me to go away! I'm so confused, I'm only 11! Should I tell my mom? Waaaaay too weird! Please help me.