Well I find that there is a problem with curses and magick. The thing is that magick is psychological. Even if you enter a deep mediation and do an intense ritual to affect quantum mechanics and cause harm in this person's life; it is still only changing your reality. This is why magick is not ever white / black or good / bad. You cannot cause harm to another by magick unless they are well aware of what you are doing and truly believe it. If one doesn't accept the power of magick it does not work, after all.
I am not sure what is going on, and you are welcome to keep such information to yourself. It would be better to protect yourself / family with magick, as that can have a true outcome. Of course, you can look at this many ways. Magick, unlike prayer, must be acted on to work rather than just hoping. So, if this is some sort of situation like a trial, you can empower your side. Again though, I don't know what's up. Sadly that is not how magick works though, not basically.
There are people, more usually groups, that successfully harm people, make their lives miserable, even end their lives, but we are talking advanced stuff here. A tribe doesn't bring rain by sending out a lone dance, it takes a group. Group magick changes multiple realities in the same way, causing a greater effect perhaps. Not sure though, just know that crazy stuff happens.