Is it obligatory to return a portion of the rent paid to the heirs of a tenant who died two months after residing in the house, knowing that the paid rent was for one year and the house was demolished due to an earthquake?

If the rented house collapses, the lease is terminated for the remaining period, and the rent is only due for the past period. So, if the tenant lived for two months out of a year, he must pay the rent for those two months (one-sixth of the total rent), and the landlord must return the remaining amount to the tenant's heirs.