can my un married aunt get a share in her father's property...

I am worried. That my aunt get any share in her father's property... My grand father and grand mother has 5 children totally.. 4daughter &1son.. In that elder daughter is unmarried.. And all are married ..my grandfather died during their children small age.. After that the his hal job was given to his son.. But the son gave that job to the unmarried sister... Later the grandfather property was transferred to my grandma... ..after his death. Now this unmarried aunt was saying with us till now.. She got retirement also.. Still staying with us. ...but my grandma made gift deed on his son mentioned all things that all daughter are given and married and my husband job given to my unmarried daughter.... Till death she can stay with my son and not get any share in my husband propety.... And made a giftdeed before she died ..now this unmarried sister (aunt)i asking for share..... ..we showed her gift deed also ...now she is saying that it's not her father's property... It's her grandfather's father property... Will she get share in my father's property.. Which he mother has gifted her.. But she don't have any proof in hand that it's her grandfather property ... And since she is unmarried and have lots of selfaquiered property... Owned by her in my grandfathers job which had given by my father to her... Can we get share in that's also... Because she is staying with us only for lifetime..