Executors are under a duty to get in the estate of the deceased, recover debts owed to the estate, to pay its liabilities and then to distribute the estate in accordance with the terms of the Will. If there is any credible evidence at all that B has misused their power in such a way as to reduce the value of the estate, then the executor should investigate. This is partly because the executors should submit a return of the entire estate for tax purposes so that, if, for example, B has misappropriated assets of the estate, those assets