What to do if there is a property dispute in the family

Hum 3 bhai aur 1bhen h .sabhi married h .Dhoke se haq tyag karwaya fir humse makan banwaya or chote Bhai ki wife ko gift kar diya jabki bade bhai ne haq tyag nahi kiya h.hum teen Bhai behn ne haq tyag kar diya h. Jabki muje papa ki property me nokri di gayi unki death k baad.aur family ne apsi sahmati pai paper par sabhi k signature sahit ek samjhota ya Batwara kiya gaya.jisme muje second floor par khud k kharche par makan banane ki permission di. Aur ab Makan banne par us par hadap karne ki mansha se tala laga diya.is situation me kya main second floor par banaya Makan lene ka Haq rakha hu ya nahi. Jabki makan me ground floor par 6 room 2 kitchen 2 lat bath h.aur first floor par 5 room 2 kitchen 2 latbath1 hall h. Second floor par mere Paise se banaye 2 room 1kitchen 2 latbath h.hame ghar se bahar nikalne ki k rahe h sabhi. Main kya kar sakta hu plz ans send me.