That estate lawyer is very intelligent and well versed in the New Jersey L/T laws.
Since the lawyer knows all the Landlord loopholes and correct eviction procedure, you may now proceed to complete the following:
Go to the property without notice and when he is not home, and start moving all his stuff out. Leave his personal belongings outside of the property next to the sidewalk or road.
Change the locks.
Shut off all utilities.
Once these things are done, call the police and when they arrive, tell them that this freeloader is trespassing and to please escort him from the property. If he returns, you will file trespassing charges.
If brother files suit, have the estate attorney represent you since he/she is already familiar with the case.