What are the rights of grandsons in ancestral property

my grandfather(hindu) got agricultural land in sonepat haryana from his ancestors in which is on papers & was undivided earlier. My grandfather died in 2015 and my grandfather has left behind his 3 sons & 2 daughters (all married) & also my grandmother which is alive. But my grandfather had done RELEASE DEED only in favour of 3 sons ( including my father) .There is nothing on rest others name. Now, in Village we have home given by my grandfather which is also his property earned from agricultural land but in the LAL DORA boundaries .I go to my village to meet my grandmother who lives alone, i visit my village home 1-2 times & got photos also there .My son age is now 1 year & he is great grand-son in our family .Request you to plz guide me on below points :: 1. Do me & my son (great-grand son) has any right in agricultural land & in income from this land ? 2. Can i file partition now or Declaration suit now so,that my father(alive now) couldn't dispose this land to kill our rights ??