What is my right ?

Sir, my name is farooq and iam from anantapur, andhra pradesh. my question is, all our properties are in the name of our grand mother's name (she purchased some and received some from their parents). details of the property. 1 acer land, 91.5 cents land, 5.5/8 cents land, 6 cents land, and a house(lives in the same house with younger son) her husband died on 1985, and she have 2 son's and the elder son is died in 1990. she registered his eldersons share on his grand son;s name after the death of her elder son. 1 acer land, 6 cents land, half in 5.5/8 cents land, and settled the shares (remaining property remained in her name till date), and the remaining for the younger son and his family containing wife and 4 children. she sold 91.5 cents land in 2017 and distributed the amount to her grand son's according her interest, she died in 2018 and property remains in my grand mothers name. here comes the problem... how the remaining property get distributed and how can i claim my share, my father and my brothers are not willing to give me the share in any thing. what should i do to claim. my grand mothers property my father and mother are alive and not willing to give me the share please suggest me what should i do. thank you sir. farooq mohammed.