He has no right in the property as your father is owner of the property father can file eviction suit.snd can take injunction.against brother and his family from.the civil.court.
Further if father is senior.citizen above.60 he can file under senior citizen welfare act.in tribunal for speedy remedy to evict brother.
Also the father can give gift or make.will of property to anyone he wishes to brother has no.right on property.
He has only right when father dies intestate without will. In life father can give property to anyone he wishes to.