To be honest I have never asked anyone.. The law is still the law though and if the heirs don't file in 6 months they will begin to incur large fines and penalties.
We are seriously thinking of setting up either a family cooperation or buying a death insurance policy to cover their inheritance tax expenses.
The cooperation route still costs quite a bit as the property has to be transferred to it either by a sale or a donation..Thus a sale or donation tax.