Oh my goodness.  I have never heard of such a thing but it is obviously a blatant abuse of his fiduciary power and if Mom is still of sound mind you need to have her excuse him from his duties asap.  If she is not of sound mind then you need to apply to be her conservator or guardian of her estate and challenge him as the POA.  As for the Executor's fee, that is not too far fetched.  Each state laws allow for an executor to be given a fee for their services but the Will may indeed state that the Executor does not receive anything.  That is also valid.  You may want to make sure that Mom wants all that too.  I think it may be time for help here.  Good luck.