1. you are a statutory protected tenant
2. since you were doing the business in the premises with your father, the tenancy right devolves on you
3. however still you can take a noc affidavit from your siblings stating that they have no claim over the tenancy
4.the noc affidavit has to be notorised and does not require any registration
5. tender the rent to the landlord by sending money orders. if the money order is returned never mind. you only have to create a record that you were prompt in the rent payment but it was the landlord who for some unknown reasons would not accept the rent
6. the landlord cannot evict you without any valid legal ground