tranfer rule for house

Our residential house was bought by my father from his salary income (not ancestral) but in my mother's name. My father died in 1990 and mother is alive. We are 2 married brothers & 4 married sisters. What is the most hassle free and less costing transfer mechanisms during my mother's life span or beyond her. I assume, sisters would not be interested (got married in 1978, 1981, 1992, 2001 & sons got married in 1994, 2009). After father's death, all the expenses of household was maintained by sons (family pension was very meager). Also house expansion, emotional & material needs of mother as well as 2 unmarried sisters (after father's death) was taken care of by sons. We are not in hurry of transfer in our mother's lifetime. Neither, we are in greed not to share with sisters. We are pretty sure, they will not like because they are well settled. It is a very small house. My only intent is to save myself from hassle. I am tired of running through govt. offices for so many years. If it is less torturous during her lifetime, I do not mind, even though I do not have any hunger. It is only for ease of functioning for several services because my mother is very old and it is difficult to take her outside even for an hour.