Rule of thumb.
Never let ur freinds date ur sisters or your sister's freinds. Period.(or visa versa) It will cause problems between you and your family. Just not worth it.
If it was still happening. I would have told you to inform him that he can't not date her. Because it crosses the line and it will have a bad aftermath.
If he cired i would have told him, sorry man this is family! Stay out of my family's friends!! Go get [censored] somewhere else.
