Can my eldest son evict from the house owned b y husband after death?

I am 72 yrs staying alone after my husbands death since 25 years i a flat in mumbai held in the names of my 2 elder sons out of which one is dead i and my third son are associate members in that flat,all my sons are staying saperately 1) can my eldest son dislocate me from the flat ? 2) can i approach the court for a stay order not to disturb me till i am alive? 3) what are the chances that i will get a stay order in my favour? 4) can i keep paying guest for my safety? pls help there is an unregistered sale agreement between my husband and eldest son, my husband when alive had filed the case