Both Mom and Dad alive. Daughter wants the entire house. Property in mom's name bought by dad

Hi Sir, Both my father and mother are alive. My sister wants to have the entire house of our property which is in the name of my mom, purchased and constructed by dad. I have already invested in the renovation of house. It was a duplex house with 3bhk and steps within the house. Now, i have renovated and have taken the steps out and moved with my family and kids to first floor. My mom wants us to move to ground floor as she wants to have the first floor and the terrace. My dad is not interested in giving away this property to my sister. But, my mom keeps yelling every day and night with me and my dad. We have lost our mental peace after moving here. Also, we have tower at the terrace. the income from tower is completely utilised by my sister and her family and my mom has also bought a plot for them in recent times. The property original documents are with my sister. Sir, Just want to know what is the role of my dad here.. he's been struggling to help me with this property. My mom doesn't respect anyone other than her daughter and son-in-law. Please help...