Property dispute among brothers

Hi, we are 3 brothers and 2 sisters. (me-one son,brother staying with me having one son,elder brother in the other house having 2 daughter,one married among them) Below is our total property description. One house that is my father's and uncle's (ancestral house).So my father;s portion is half of the house where my elder brother stays with his family. 2nd house which brought by 3 brothers currently me and my another brother staying more than 25 years. Mutually we have agreed that elder brother will stay at ancestral house and we two brother will stay at new house. Currently elder brother (staying in ancestral) filed a partition suit to the new house where both of us staying. What we did mean while:------ we two brother got the sisters share of the ancestral house as a gift. So both of us holding ancestral house share as 4/5th of our fathers property 1/2 of the house. What we want---- 1.we want to purchase 1/3 of the elder brother share of the new house. 2.we do not want any partition two our new house.(we are staying in 1st and 2nd floor,ground floor is a PG) 3.Elder brother do not have any position currently in the new house. 4.Can we settle it via purchase by blocking the partition.