Harassment from Grandparents towards my parents

I stay with my parents my brother and my grandparents. My grandfather gifted the property to my father and rest of his properties to his daughter along with bank balance as well. He is super senior citizen and as also has pention my father's age is 59 and he doesn't have pension. My father is looking after his parents but still they are blaming my father and mother that they should pay them the money for their doctors things even though they get the pension and they route their pension to there daughter. My father denied giving the money due to which now grandparents are torturing us to leave the house or else he will self the property where we are leaving we explained our grandparents that you have gifted the property without any conditions, and now they have started blaming us that we have made the gift property fraudulently. We also informed them to approach the court to get it verified but my grandfather always keep on bring clients to show the house. We have all proofs with regards to the videos wherein my grandfather always keep on changing his statements every 6 months