how to make land paper step by step at my mam and my name jointly

we are brother and elder sister of our parents . after my fathers death my mother want to donate the house after her death at my name in future.that time my father buy the land at 70,000/- where i gave 50,000/- and my mother gave 20,000/- but we have no name. now my sister act very bad against us.so please guide us how to make danpattra from my mothers side. we want the paper in my mam and my name jointly.even we have no idea about danpattra. you show us a sample danpattra it would be very much helpful to us.my mam is living with me. she is diabetic , high blood pressure, thiroid , nurve problem etc. i am taking care of her only. my sister and her husband is waiting for her death only. they have so much power.plz guide us to how to make the paper at our joint name. i am just a III grade tea garden employee so you can imagine my financial condition. plz guide us.we are hindu.