My mother bank account frozen

My friend recieved money from somewhere mistakenly i dont know about that, i gave money to my friend long ago but he sent money to me from that amount he recieved from somewhere ( who filed complaint against him ) , from that amount i transferred that amount to my mother bank account , that we are using from 11 years , ( amount was around 3 lakhs rs that i transferred to it ) , but now my account is normal but my mother account got frozen with lien of 20k rs in name of ministry of Home affairs and it have all of our family life savings and fixed deposit, i asked bank for help they told me there is some FIR from Tamil Nadu , what should I do ? And if that amount was fraudulent why my account is not frozen ? And if particular transaction have issues why police frozen all of our life savings that is 10 times more then that amount? Sir please help me that our whole family life savings , what would be the solution? Or is FIR will be against my mother or the person ( my friend who recieved that amount and transfer to me)