Relatives trying to harm us on property dispute

Hi guys.. while I'm writing this I'm scared to death. So the issue is that my father's brother in law has eyes on our property which is under loan. The guy is tempered and tried to physically harm my dad multiple times and we've been witnessing this from years. My father is staying calm because his sister is married to this psycho and all these people are in their mid 50s . My aunt's property has been distributed to her when our grandfather was alive despite that this so called brother in law has been trying to kill my dad over the years but my father stayed put. As the years passed by the guy stayed silent but now that my brother and I are going to college he started some sparks in our family and he's been targetting me . He came with a knife .. vettu kathi to threaten me and I'm scared to death over this. I don't know whether to go to the police station or not . We're not financially stable to go to the court or anything. I'm feeling helpless and scared