After the death of the tenant, the lease agreement between you and your tenant is no longer valid as one of the parties to the contract is no longer alive. Unfortunately there have been cases, where the children of the tenants have occupied property even after the death of the parents. (http://www.dnaindia.com/india/report-tenancy-ends-when-tenant-dies-sc-4165). It is advised that you must ask the occupier of the property to vacate the property as soon as possible. In case they do not move out, file a case of trespassing against them.
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