What to do about friend trying to get with me sister ?
This guy I thought was my friend has taken an interest in my sister. To make a long story short. He was my mentor at the tennis camp my sister and I go to. We are both 15. He is 17 and really good so he was designated to be my "mentor". He seemed really cool. He's hilarious etc and we were friendly. Thing is I've noticed him talking to my sister a lot more at camp and pairing up with her in activities. He has a reputation for being a player and as her brother this immediately set off my alarm. I knew I was right when I asked her why she giggling so much while texting at a family lunch. She wouldn't tell me but I found out it was him. I asked her best friend if she liked him and she told me that my sister would do anything to get him to be her boyfriend.
She's only dated two boys and they were both her age and definitely not trouble. Whats the best way to convince this guy to stop playing my sister.
Ps. My parents have met him and think he's a saint. And that my sister is just friends with him. They are oblivious to his true ways.