All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
First of all, we ask Allaah to make a way out to your difficulties and your family's, and to protect you from any calamity, and wipe out your sins due to what befell you.
It should be noted that it is very serious to accuse your relatives of having done magic and evil to you unless you are certain about this or that there are some indications which predominantly make you believe that they did this to you.
As regards what you should do and whether or not there is any cure in addition to the Quran; first of all, we advise you to supplicate Allaah because supplication is the best weapon a believer possesses, and it is a way of achieving many benefits, but many people are negligent about it. Secondly, you should sincerely repent to Allaah from your sins because sins can cause calamities. Allaah Says (what means): {And whatever strikes you of disaster — it is for what your hands have earned; but He pardons much.}[Quran 42:30].
However, if you are certain that it is your relatives who are harming you with magic or that you predominantly think so because of incidents that strongly indicate this, then it is permissible for you to cut the ties of kinship with them and not accept their gift, whether it is food or else, in order to be safe from their evil.
As regards killing them, we do not think that this is permissible for two reasons:
1- It is only the Islamic judge who may implement the Hadd (i.e. the corporal punishment determined by the Islamic Law) on people, because if every one is allowed to do so, anarchy and evil will spread. For more benefit, please refer to Fatwa 90225.
2- Killing them –if they deserve to be killed –can lead to a greater evil than the evil of them harming you, as you may be imprisoned or even killed [because of killing them].
For more benefit, please refer to Fataawa 88660 and 83703.
Allaah Knows best.