Can unmarried daughter eligible for her father's pension?

My father passed away in the year 2021. Before his death, he was a pensioner as he got retired from the post of DGM from BSNL deptt. After his demise my mother is getting pension. I’m graduate, unmarried and not working right now. My mother always abuse me and mentally harass me, I’m not getting support from her financially despite the fact that I’ve been taking responsibility of my house and my mother too but no matter what she instigates my younger brother to beat me up. whenever she feels that she is losing control over me moreover I’ve been beaten up brutally by my brother, few times which has put my life in danger. He’s working out of hometown and married now still my mother gives him average amount of money every month. In that situation what should i do? Also Am i eligible for my deceased father pension? If yes, then how can i get a claim?