You can only advise them. and if they persist on using them still, they are sinful.

Pray for their guidance and try to talk to someone who they listen to in order to warn them of the sin they are indulging in.

My sister is going through some illness…and my brother in law hanging amulets or some pieces of wood on my sisters hand..and i know its completely shirk…so if take a stand to remove that amulets knowing the couple will have chaos later on this issue…wht should i do in this case…i tried to make them understand..but they dont…wht should i do in this situation.

Shirk and its different forms | November 9, 2015 3:12 am
Previous

Should i pray behind an imam in these two scenarios… A- I was told by someone that he blew on them and said that he will have a dream after the imam visited a known magician who I was warning against. B- I was told by someone when giving dawah to tawheed that this mufti writes taweez. They used this as an arguemnt to defend taweez. I am convinced by the individual’s testimony.
Next

I wanted to ask that what are the signs of a mushrik? Can we call a Muslim person mushrik..if we see those signs in him? Is it allowed for a Ahle tauheed ( believer of tauheed) to marry a mushrik (though their beliefs are not correct but they are Muslim? ??