How should the questioner dispose of the money remaining with him from the deceased's trust, knowing that the deceased's brother took part of the money without the parents' knowledge, and is it obligatory to inform them of that?

If the owner of a deposit dies and has no executor or creditors, then the person holding the deposit must return it to the deceased's heirs, and he is compelled to pay it to them. However, if the deceased has an executor or debts, the deposit is handed over to the executor, or the creditors and heirs are gathered, and the deposit is given to the heirs after informing them that it was a deposit. In the event that the deceased's father is alive, his brother does not inherit with him, and the heirs must be informed of the amount paid to the deceased's brother.