You should not have taken it from your uncle in the first place and
should have warned your uncle from such practices!
You must tell your brother that he gave you some thing but due to
the fear of shirk involved in it you tried to keep them safe from it,
and tell them about the knowledge you have about amulets, for more
correct  knowledge refer to the link given.

 

My uncle came to visit us and see my brothers son(a baby ,1 and half a year) crying out loud. at this he (uncle) said the baby is afflicted by the evil eye and he gave us something a flour( or powder) like substance originally made from plant roots as a remedy for an evil eye. which is to feed the baby by mixing with food and drink as well as to make the baby wear this substance around his neck. my uncle give me this substance to give them for their baby by my hand by telling me the procedures, how to use it. yet I do not give them and it is still with me. now my brother is planning to go to my uncles village in order to find a medicine for an evil eye. and if my uncle tells him that he already give it to me that medicine(i.e substance); my brother will really fight with me. First, what is the ruling on this? What can I do plz ? did i give him before he went to the village?

Shirk and its different forms | September 7, 2015 2:40 am
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I READ A BOOK ABOUT TAWHID, IT STATES DOING A RIGHTEOUS DEED FOR WORDLY GAINS IS SHIRK, WHAT DOES THAT REALLY MEAN AS I ONLY KNOW OF DOING GOOD DEEDS TO SHOW OFF WHICH IS SHIRK
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I told my brother that there is a fear of shirk involved in such practices. but he claims that it is bad if they make a baby to wear that thing on his neck & it is OK to feed him or to burn the substance so that the baby could smell its smoke. I advise him by saying ” please be patient and look after the baby” but he insist and keep asking me for the substance. at last I give him by saying that I m free from what you’ve done but i wish if u could not do it. is his claim right or wrong? am I regarded as the one who have helped them on this? May Allah (exalted be He) reward you.