Grandmother's property

DESCRIPTION 1. My grand mom has four children...SON, DAUGHTER 1, DAUGHTER 2 & DAUGHTER 3. 2. SON died in 1982 & Grand mom died in 1987. 3. SON has 1 WIFE (My mother) , 1 SON (Me, Age-42 yrs.) and 1 DAUGHTER (My sister, Age-38 yrs). We three are staying on this land for last 42 years. 4. I have constructed a home (In 2015) by taking a loan from magma HFC (I am 1st applicant and my mother and sister are co-applicants of that loan), but I am paying the EMIs. 5. As soon as I got married (In 2017), my mother and my sister are asking to divide the whole land into three parts. Now it is not possible as I have already made a construction on it. MY QUESTIONS: 1. Who are the actual heir of that land and what is our actual part on it? 2. I have been paying the EMIs. Shall I get larger part of that construction along with land? 3. If I stop paying EMIs, what will happen? 4. Else, what should I do now? There are so many family issues raised that I am unable to disclose here. Please help as I am unable to stay at home from 2017 when I got married. I have a daughter of 1.5 yrs. On your suggestion I will move forward.