err, this kind of crazy people, you need to be very careful or put enough distance if possible. the thing is if they just kacau your friend maybe he will still ok, but when they desperate they usually do have the capacity to hurt other people family and friends, so that is something your friend want to consider how to prevent from happening.

i am very not sure if friend of yours can eventually make peace with gf's sister or the issue about lack of parent attention can be solved (could be sign of narcissistic behaviour disorder?), but i would say even if he wants to try date this girl, this issue should be taken into account with some serious thought, if he is willing to put up with more nonsense to come.

This post has been edited by Hammox: Mar 1 2017, 08:16 PM