ANSWER:

If they’re still in your name, you must sell them off and take only the money that you got it for and give away anything extra if you get, to the poor muslims. 

You should not let your mum keep them as they’re on your name and the sin will be on you. 

shaikh i had purchased some prize bonds earlier.Now i want to sell them since i came to know that they are not halal.My mom refused to sell them instead now she uses them.Now what i do in this case?since it was money.Alhtough i dont usem them or pay zakaat for them.