what is the remedy where a partition suit has been filed by brother

We are two brothers and havs no sisters.we reside at a two storied building, my elder brother in the first floor with his family and myself in the ground floor.after death of my father the property was mutated in the name of my mother and two sons.My mother also died in 2014.since then the property is undevided.there is a small rectangular shape land in front of our house and common main entrance 8-9'ft.wide along it. Our water reservoir,septic tank,staircase is also common. My elder brother used to pressurise me to decide the land for his interest,i.e for plantation, or commercial purpose , i didnot agree for my privacy or inconvenience since I am in the ground floor. I advised him to keep the land mutually common so that both of us can use the space for car parking by making a shed, he did not agree.Recently he filed a partition suit against me. Sir what would be my defence? Is his claim justified, if yes,can I claim for division of roof 50:50 which is also a common area. Pls help