Cheated my mom

My grandparents have taken the responsibility of my mom,me and my brother as my father is irresponsible,but in middle in bussiness they have given all responsibilites to an outside person even tough my mom is telling not to give,they didin't listen to my mom and they are then my mom is asking my grandparents to come and help in bussiness they didnt do that instead they made my mom to stop bussiness, then they came to us after that also my mom asking them to keep case on my father they didn't do that and not taken any responsibilities other than keeping food for us so my mom had beaten them ,now all those responsibilities are on outside person,but now they went to police station and put a case on my mom telling that my mom had beaten them and they told to send that person out now and they will not take our responsibilites of us expect food as same even tough they have asset not selling that, telling us to study in any collage where there is no quality education as of till now what they did.till 10th class my grandparents had only paid fees as it is small amounts ,now fees is in bigger amounts so they are trying to escape from responsibilites.so how can i(grand daugther) put a case against my grandparents now?