Can daughters challenge against a settlement deed

my name is latha age 58 , It's a Self acquired property by my mother and father jointly in 1978,father was expired , mother is alive(hindu). My mother have 2 sons and 2 daughters. she gave this property to grand sons of my elder brother through gift deed in 2005. but in this gift deed as a witness only my elder brother has signed ?the same has not been accepted (signed ) by two grand sons yet in the deed? pls confirm as a daughter can i challenge against this gift deed ?