Agricultural land registration in Telangana

I am from the state of Telangana . My father is 80+ and in his last days . On the other hand my mother is also 70+ with some chronic health issues. My father owns 5acres of agricultural land on his name , my mother too owns 5 acres of land. I have 2 married elder sisters and are in their 50s now. As my father is in his death bed he thought of transferring his properties. All the property mentioned is ancestral property. My father and my mother wishes to register the entire land and property they own on my name. My sister's never cared about my parents in the past and my parents are against them in sharing land and property . We are from a middle class background and unaware of the system changes. Recently Dharani portal has been introduced in the state of Telangana and I have heard that registrations for land transfer have to be done through this portal only. My sister challenged - it is mandatory that my sister's signatures are also required for land registration on my name. My sister's are completely against me from the beginning itself and will surely oppose to sign. Even if my father try to convince them , they would not agree upon it. I have no idea about Dharani portal and how it works. It is free wish of my father to transfer the land on my name. What are the options before me ? Should we go ahead for registration even if my sister oppose it ?Is there any legal obligation that their signatures of acceptance is required? Also if my father pass away without registration what will the consequences be ? I have heard of will , shall a will favour me in this situation . What are other alternatives to save my land and deal it in a peaceful manner. Could a will be applicable to my mother as well ? My sister's being influential are in a way threatening me to forget about this land. I don't know even all the above said are just rumors around and my apprehensions are unfounded. I would be really gladful if you can mention what among the above are true. Please help me in this regards