well, that's really a delicated situation. I think you should try talking to your mom about it and see what she thinks about this issue and then consequently tell your dad (since he is still friends with this guy). I know it's difficult to open up about this type of things but your dad really need to cut off ties with this dude.
ps: but before saying anything to your parents, talk to your sister, and if she is scared or ashamed try to encourage her.
I'm not really clear with the story, but if you haven't tell your parents about this, I believe that means your sister doesn't want to tell them. It would be better to bring adults in this matter. You can ask someone (an adult) that you trust to help. But I believe you should tell your parents cause they will be sad if they know this latter on and thought themselves bout why they didn't realize it. But if or by chance they don't believe you, as the oldest sister you should scold you parent and be serious in this matter.
And you should get some proof, for example ss of chat, record of voice or video so you could send that man to the jail or threat him. But it would be best to report him to the police but you should let your sister decide and make sure to watch her every time but also give her privacy times and don't threat her differently cause it would be uncomfortable.
But I rec you to search professional advice cause im not confident my advise can help. But i wish your sister well
I do want to tell some one but I don't want to push her because she has really bad trust issue and I don't want her to stop telling me stuff and she has tried to harm her self before so I thought about threatening the guy and then tell him to set away form her and stuff
Just in case make sure to bring something for your own safety and of course check the laws about self defense, so you won't make mistake(๑•ㅂ•)و✧ for example bring pepper spray, pocket knife or stun guns, it would be better if you can bring someone with you too. And record your conversation with that man so if he still doing it you can just play the rec to your parents or the police. I oso rec learning self defense with your sister too for a safety measures. And for your sister, bring her to someplace where she can enjoy, dang i forgot bout covid, how bout play a game with her or watch some movies together ٩(๑❛ᴗ❛๑)۶ make her smile .
If you're doing it by text just show him some proof that you can use to threat that man. Strong proof would be better. If he still doesn't listen, you really need to tell your parents cause it will be more dangerous. And if you can hold your sis phone by secret or by permission, save the kan number in your contact and make sure to ss the chat so u can make it as a proof. And it would be better to change your sister sim card, make a fresh start. But i still advice you to search for a professional help and tell your parents cause u never know how dangerous this could be
Thanks the advice I really need it
The reason why I’m posting it here because all the places I went to post this look like they would report to the police and I don’t want to do anything with out my sister knowing. My little sister has opened up to me about stuff That happen to her like this guy did her well she was really drunk she was 13 at the time And how when we was on holiday with our parents and stuff this 20-year-old that my dad made friends and still now with on holiday touched and kissed her tell not to tell anyone and that he would date her when she older I just wanna know how I can help her and if I should say anything cos I dont want to hurt or scare her or if I should say anything to the 20 year old or not I’m 16 and 15 now so I don’t know what to say to help