I'll try to keep this as short as possible. My mum is quite good friends with our ex neighbour and his now girlfriend and they all see each other often. I despise the guy, he's an absolute chav and a creep.
When I was 15, I had a 16 year old friend who revealed to me that she had been sleeping with him for some time (he was mid-thirties at this point), in the same conversation she told me that he said that he had once come to my front door door to speak to my mum and I apparently came downstairs naked. This never happened and it completely disturbed me. He would always try to make conversation with me whenever he came over and I'd brush him off as he really weirded me out.
I felt too nervous to tell my mum the comment he made about me but I did tell her that he'd been sleeping with my sixteen year old friend to which she just replied "oh (his name) would just sleep with anyone so that doesn't surprise me."
Trouble is, my little sister is now 13 years old and I feel so uncomfortable with him being around her. I want to try speaking to my mum about it again but I don't even know what I'd do if she just dismissed me again. Would really appreciate some advice, thank you x