Capital gain - property sale out

I have inherited an apartment from my father who died without a will.My mother and sister are also co-owner . We want to sale this flat now . my mother (Sr citizen) and sister don't have any income as such other than some interest on Fixed deposits. Want to know how the sale deed can be done with 3 owners and how it will impact our taxability and if any optimization possible .Sale value Rs.25 lacs .