Curses, Defense against and breaking them. Options

I dont know if this is the right place to post this, but here goes.
I have reasons to believe that a friend's father and maybe even my friend could be under a spell or curse that was cast either by the father's wife (who would be my friend's stepmother..more like stepmonster) or mother in law...
I wanted to know if anyone knew a way to maybe counter it, or just end the curse or spell and how protect onself and others from further spell castings or curses against myself and my friend. I thought of using a reflective shield for myself, however my friend does not practice the occult and i dont think she would know how even if i explained. I thought of maybe enchanting amulets or some specific stone. I dont know exactly what symbols for talismans or amulets to charge or enchant, and i wouldnt know what stone to use. So if anyone could point me in the right direction i would really appreciate it. Also, does the Salomon Pentacle of Tetragrammaton protects against these kinds of things too? or does it only limits itself to the 72 spirits of the goetia?.

Alright well, thanks in advanced =)
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Well she is catholic and she does believe in some stuff of the occult but she doesn't want to mess around with it because she scares very very very easily and since she is catholic she has a very catholic view about magick. I do the reflective shield too for lots of things i have never tried to create one for anyone other than myself so i guess i could try that too. Thanks a lot.
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