Is it permissible to take the value of the amount deposited with the Hasbi Council in gold at the time of freezing, and then calculate its current value in gold, to compensate for the loss of its original value while avoiding usurious interest, in order to preserve the right of the orphaned brother?

It is obligatory to take the principal amount and dispose of the usurious interest by giving it to the poor and needy, and not to leave it with the bank. If your brother is poor, there is no harm in him taking that interest and benefiting from it. Al-Nawawi said: "If unlawful money is given to a poor person, it does not become unlawful for the poor person; rather, it becomes lawful and pure for him, and he may give it as charity to himself and his dependents if he is poor."