Maybe I will slowly sell my stuff as I get old and buy silver/gold coins then when i die my kids get it. The government will never know that my relatives inherited the money. Even if they cash it all at once they can just say they received it one coin every month as they grew up etc.
This is of course assuming they do not fight over it.
Arguably though when the granddaughter sells the BMW she still gets more money than she started with. Inheritance taxes don't kick in till something like 1-2 million $ I thought. Maybe there is some other type of tax on smaller inheritance items?