Grocery store prices do not vary significantly across German federate states. The main part of cost of living differences comes from housing prices. Restaurant prices vary more than grocery store prices too.

When my last parent dies, almost half of their property value goes to tax, the rest I’d split with siblings

Where do you live of I may ask? In Germany, even assuming a laughably expensive property worth 2 million EUR and without any tax optimizations, with 2 siblings you’d have to pay a bit below 30k EUR in taxes and receive property worth 667k EUR per child. If you got the property worth 2 million only yourself, you’d have to pay around 300k in taxes max.