1. The tenancy on the death of your father is i inherited by his legal heirs which include you and his other children,which are none in your case. So the landlord can not evict you merely for the death of your father.
2. If your are willing then you can always purchase this property. There is no harm in it. Otherwise ask the landlord to issue rent receipt in your name and once that is done there is nothing to worry anymore.
3. On redevelopment you will get only the tenancy rights . A tenant can never become a owner unless he purchases any part of the tenancy or full of it.