The secocndary executor had better get a good probate lawyer on board. There are remedies against a fiduciary who has failed, but there is a specific way to proceed and you can't do it on your own.
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There may be causes of action for breach of fiduciary on at least part of the breach but it has to be done with a very specific petition for accounting and breach of fiduciary duty. This is a complicated area and your best best for recovery is with the assistance of an attorney.