How to transfer property from the grandfather to father ??

I married to a man by going against my parents and now we are living with his parents. In Indra Gandhi time, she gave a plot on my grandfather-in-law name. The Grandfather-In-law has four children elder daughter, a son and three more younger sisters, totally five. One younger sister died a year back and all sister are married and settled in their own husband’s property. The Grandfather-in-Law also died long back but the grandmother-in-law is alive counting her last days. The Grandfather-in-law got the plot from Indra Gandhi mam and he built a small “Juggi” at that time after he died my father-in-law built a two floors house on that plot. My father-in-law is an alcoholic person and after a point when my husband was in 8th class my father-in-law has stopped giving money to his family, instead he spent his money on alcohol and their sister's children marriage etc. This same happen for a long time and between my mother-in-law leaves both my husband and father-in-law (now a liver damaged patient and a diabetes person) for 2 years without informing. Between these 2 years only we got married during that time my husband has been constructing the house with four floors, with my father-in-law retirement money along with his savings but some contractor cheated my husband and the house can’t complete. After some my mother-in-law is back, I and my husband managed to earn some money and completed the four floors house from the bottom to top. Now my grandmother-in-law who never ever with my mother-in-law, was living in one of the three sister's home for long time, is sick. Now that sisters are wanting to make money on behalf of grandmother by saying that give one floor's rent to us. We refused because we are filling the loan on our house completion. But now that all sisters and their families are saying that this house is our father's house. You had to give or either you had to see upon your grandmother. But my mother-in-law in refusing to see upon her own mother-in-law. In between these all conflicts me and my husband are in risk of not getting the house, when the house is in construction no one claim, after the completion now all are claiming. Ultimately me and my husband's money is spent on this house a lot. How to Solve this conflict and the plot doesn't have the Registry Papers? We spent the money on this, we want at least three floors on our name after my father and mother-in-law death. so that no one can claim on our money spent on this house. Give us some solutions to get rid of this dispute?