Is my sisters friend a pedophile?

This was back in 2009. I think my friend, and I were about 15, and my sister, and her friend were like 18. I've never even thought about this until last night. I lived with my mom, and back then we had a lot of party's there. There were always people coming and going that I didn't know. One day my sisters friend was over. She was very drunk. My friend was there too. He came up to me, and was like "dude, we were dancing, and she was like grinding up against me". He seemed really proud, and I was just like "lucky", but now I think of it as very weird that she would grind up against a 15 year old boy. She's in her 30s now, and I haven't really associated with her since like 2012. She has a husband, and a couple kids now. I guess im just kind of worried she's doing inappropriate things like that with her kids, or with other kids. What do you think?

Is my sisters friend a pedophile?
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