Can I challenge a registered gift deed

my father died at the age of 89 on 12 /09/ 2014 . 8th days before the death of my father I come to know that a gift deed of our house was done in favour of my sister,mother,and brother. (The gift deed was done in the month of may. ) The gift deed is registered. The relation between me and my father was good. my family members took the advantages of my father's old age and i am dam sure it is done forcefully , because my mother accepted it that my father was not ready for that. my sister and brotherr are fully responsible for this,because our relations are not good.