Do I have the right to claim that property of my grandma

Grandfather-5 acres. 5 acres were written in the name of grandmother.father brought loan on those 5 acres.He registered 3 acres of land on my mother and took another loan with those 3 acres without clearing former loan. lands survey numbers remain the same like grand mother- 99 and mothers - 99A. This all happened without the involvement of my mother,grandmother and myself by doing some fraud. Now he registered another two acres in his name. Do he have the right to sell or write those two acres to somebody without our involvement ? Do I have the right to claim that property through grandma?